That is a printer ink refill kit.

Specifically, it’s:

Ankink 31 / 32XL Premium Ink Refill Bottles (4-pack)

What it’s used for:

It’s used to refill ink cartridges in compatible inkjet printers instead of buying brand-new cartridges.

What’s inside:

Black – 140ml

Cyan – 100ml

Magenta – 100ml

Yellow – 100ml

Total: 440ml

What printers it’s typically for:

“31” and “32XL” usually refer to cartridge models used in certain HP inkjet printers (especially HP DeskJet and HP OfficeJet models that use HP 31 or HP 32XL cartridges).

How it’s used:

You:

Remove your empty cartridge.

Inject the matching color ink into the refill hole (usually with a syringe).

Seal it and reinstall it in the printer.

It’s a cheaper alternative to buying new cartridges but can be messy if you’re not careful.

Box includes the ink only.

Compatible Printer Models

The 31 and 32XL ink bottles are compatible with the following printers:

HP Smart Tank Series: 5000, 5101, 5102, 5103, 5105, 5106, 5107, 5108, 6001, 6002, 7001, 7002, 7005, 7006, 7301, 7302, 7305, 7306, 7601, 7602, 7605, 7606, 720, 750, 790

HP Smart Tank Plus Series: 500, 515, 530, 551, 555, 557, 559, 570, 571, 578, 600, 615, 617, 650, 651, 655, 675

HP Ink Tank Series: 310, 319, 410, 415, 416, 418, 419

HP DeskJet GT Series: GT-5810, GT-5820, GT-5822

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LD Products

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Key Information About the Ink

32XL Black: High-capacity pigment black ink bottle (approx. 135ml–165ml), capable of printing 6,000 to 10,000 pages.

31 Color: Dye-based color ink bottles (Cyan, Magenta, Yellow, approx. 70ml–100ml each), capable of printing 6,000 to 8,500 pages.

Usage: Designed for easy, spill-free, and auto-stop filling of the ink tanks.

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Note: The 31/32XL bottles are often used in the same printer series as 30-series bottles, but the 32XL offers a higher yield for black