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Cartridge Comparison Guide
  • Cartridge Types
  • Ink & Toner Basics
  • Number of Pages & Shelf Life
Cartridge Type
Genuine or OEM (Original) Cartridges Remanufactured Cartridges Compatible Cartridges
Description OEM stands for original equipment manufacturer, meaning the cartridge was made by the same company that made your printer. Original brand cartridges are very reliable and sometimes the only option if your printer is new to market or uncommon. Remanufactured ink is a genuine brand cartridge that has gone through one cycle of use. After use, the cartridge is recycled, acquired by a remanufacturing facility and put through a rigorous professional refurbishing process. During the refurbishing process the cartridge is disassembled, thoroughly cleaned and tested for quality. It's then carefully refilled, tested again and brought back to life. Buying remanufactured prevents one less cartridge from ending up in a landfill. A compatible cartridge is a brand new ink cartridge built by a manufacturer other than your printer. It's like buying the generic version of the genuine brand. Most are uniquely designed to differentiate from genuine cartridges. Despite any structural difference you may notice, the cartridge will still fit in your machine and print a full yield, just like the original brand.
Price Factors Many printer manufacturers follow the razor-and-blades business model which may result in higher priced genuine cartridges. Remanufactured ink is much cheaper than the original brand ink. It's far more cost effective to refurbish a previously used cartridge than create a new OEM from scratch. Compatible ink is much cheaper than the original brand. Compatible suppliers don't have to worry about the additional costs that hinder OEMs like new printers or firmware, which lets them keep prices low.
Quality Original cartridges work extremely well and are covered under a warranty by the printer manufacturer High quality remanufactured ink will match the quality of the original, but not all remanufactured ink is created equal. Make sure you buy from a reputable supplier in order to get the absolute best results. High quality compatible ink will match the quality of the original, but not all compatible ink is created equal. Make sure you buy from a reputable supplier in order to get the absolute best results.
What's the difference between ink and toner cartridges?
Ink Cartridges Toner Cartridges
Printer Type Work with inkjet printers Work with laser printers
Material Liquid ink Dry powder
How it works Inkjet printers use a series of nozzles that spray tiny drops of ink directly on the print suface Laser toner printers use static electricity and heat to bond dry toner powder to a page
Commonly used by Casual home users, small business and photographers Large businesses and schools
Number of Pages You Can Print A cartridge's page yield is the estimated number of pages you can print. Page yield is based on 5% page coverage. This means that the quoted page yield is based upon printed pages where only 5% of the page has been imprinted with ink. For example, a short memo has approximately 5% coverage. If you have a cartridge that has a yield of 500 pages, it can print 500 pages of that short memo. If you are printing letters, photos or graphics, your coverage will vary greatly and your page yield will drop significantly.
Cartridge Warranty and Shelf Life Most ink and toner cartridges include a warranty or "best by" date on their box. Remanufactured and compatible ink cartridges can last 12-18 months unopened, and toner cartridges can last up to 3 years.
Cartridge Care and Storage Only open a cartridge when you need it. Opened cartridges will eventually dry out, especially if the protective tape or clip has been removed. If you have an open ink cartridge around and would like to try and prevent it from drying out, place it nozzle side up in a plastic airtight tub. If your cartridge came with protective tape or a clip reapply both before storing. Place a damp cloth or paper towel in the tub, next to the cartridge and keep it stored in a cool, dark place.

Inkjet Refill Kit for Hewlett Packard (HP) 21 & 21XL Black Ink Cartridges

Reg. Price $17.99

Our Price $11.99

In stock

Buy 3 or More Black for $11.00 each (save $2.97+)
Bundle Breakdown
RFK001BX includes:
RFK001B 1 11.99
  • Compatible Printers

  • Description / Specifications

  • Q&A and Reviews

Choose your printer below for a full list of products
HP - Deskjet
HP - OfficeJet
- Refill Kits by Brand


Purchasing new inkjet cartridges is not always necessary, take advantage of your existing empty cartridge by simply refilling it! Our LD C9351AN and CH569AN (HP 21 & 21XL) black inkjet refill kit comes with everything you need to refill your ink cartridge at home, so you can refill and get back to printing in no time! This cost-efficient alternative includes instructions that are easy to follow, and all the supplies necessary. Our inkjet refill kits are backed by a 100% Money-Back Quality Satisfaction Guarantee.


Item Code Printer Brand Model Name Ink Color Cartridge Yield Type Page Yield Cost Per Page Shelf Life
RFK001BX HP C9351AN Black Standard 380 3.16 cents 24-36 Months
*Average cartridge page yield in accordance with ISO IEC 24711

Do you have questions about this product?

Get answers from real customers and in-house experts with AnswerBox.

1 Question | 1 Answer
Displaying question 1
  • Q:

    Does this refill kit work for the HP 54 cartridge?

    I don't see where you are selling the 21XL cartridge but you are selling the HP 54. Are thise interchangeable and does this refill kit work for both of them? Thanks!
    Asked on 11/28/2014 by Tammi from Denver, CO, USA

    1 answer

    • A:

      This refill kit will work for the HP 54 black cartridge. We do sell HP 21 as well. Please call with your printer model number and we can let you know all the options we have for it. 888-321-2552

      Answered on 12/3/2014 by StaffLD from Long Beach, CA, USA
Displaying question 1

Do you have a question about this product? 


by PowerReviews
LD Ink Refill Kit for HP 21 and 21XL Black

(based on 5 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars




of respondents would recommend this to a friend.

Reviewed by 5 customers

Displaying reviews 1-5

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(0 of 1 customers found this review helpful)




from boca raton.fl.4

Verified Buyer

Comments about LD Ink Refill Kit for HP 21 and 21XL Black:

every thing ok.
complete as described.
would buy again.

(0 of 1 customers found this review helpful)



By Max

from Lynchburg VA

Verified Buyer

Comments about LD Ink Refill Kit for HP 21 and 21XL Black:


(0 of 1 customers found this review helpful)


works great

By sammy67

from New York

Site Member

Comments about LD Ink Refill Kit for HP 21 and 21XL Black:

this makes the fifth or sixth time I have used this product it saves me lots of money and is easy to use

(3 of 4 customers found this review helpful)


easiest to use refill kit yet

By newman2013

from Hillbilly Hills, NC

Site Member

Comments about LD Ink Refill Kit for HP 21 and 21XL Black:

I found the instructions awkward at first until I realized that the syringe was for extracting the "overfill" and then all was well. It is a well designed kit and my cartridges work well. I'll know more once I see how many refills I get out of the package but it looks very promising.

(0 of 1 customers found this review helpful)


good price

By ricki

from wisconsin

Site Member

Comments about LD Ink Refill Kit for HP 21 and 21XL Black:

easy to use,store, directions abit hazy . other refills say to tape over injection hole, this didn't. do you?

good price, free shipping!

Displaying reviews 1-5

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