INKUTEN HP 934 935 Ink Refill Kit for HP 934XL 935XL Ink Cartridges for HP OfficeJet 6812, OfficeJet 6815, OfficeJet Pro 6230, OfficeJet Pro 6830, OfficeJet Pro 6835 Printers Easy to use, Instructions included Cartridge: 934/934XL - 935/935XL - 4 Color The ink tank and syringe for this product is designed as leakage-proofing. The operation is very easy, cartridge is easily to fit on the pedestal, even no need any experience on refilling. It is truly a money saving and environment friendly DIY refilling product. 100% Quality Satisfaction Guarantee.One-Year Warranty against defects. Free shipping on Same day or the next business day via USPS. Compatible With: OfficeJet 6812, OfficeJet 6815, OfficeJet Pro 6230, OfficeJet Pro 6830, OfficeJet Pro 6835 Printers