HP Sprocket Zink paper Sprocket 3×4 50-pack 3.5×4.25. Zink photo paper for Spricket 3×4 printer. Fit Big smiles on big paper. Print moments on 8,89×10,80 cm paper Sticky-backed paper No ink, toner or cartridge needed Smudge proof, waterproof and tear resistant Customize and edit photos before you print using the HP Sprocket App Compatible with the HP Sprocket 3X4 printer