we obtained inventive patent (patent no. 200410046133.9) on ink cartridge. it means we can offer best quality products at competitive price. the quality of this patent cartridge is excellent! inkjet cartridges, printer cartridges and laser toner cartridges are compatible for hp,canon,epson,lexmark and ciss (continuous ink supply system) please check the following items for our business: (1)we 100% guarantee the quality and agree 1:1 replace for defective products. (2)packaging:ph brand packing and neutral packaging.(oem) (3)moq should be above us$1000 for trial order.(sample besides) (4)payment item:t/t in advance or irrevocable l/c at sight. (5)delivery time:5~7 days after receiving payment.(mainly up to the quantity) (6)we will apply original certificate for you to avoid high charge of custome (7)if any questions with the products,please email to: service@joycolor.com,our serviceman will reply you asap. (8)please visit here: http://www.joycolor.com/english/zxcp.asp for certificate documents.