Non-damaging refill kit TN-8105Instruction: This is the most convenient, easy-to-use and economical way of refilling your cartridge without damaging it available in the market . TN-8105 is made according to the cartridge structure allowing you to refill the cartridge without damaging it. You may cartridge through the print head where the ink and air come out. It can de re-used for many times and greatly reduce your printing cost. TN-8105 is suitable for use with:HP27/28/56/57/816/21/22 SAMSUNG M40/45/85 1 put on the disposable glove, let the cartridge print head face down to match with the rubber mat at the bottom of the ink filling rack. Then press hardly both on the cartridge and the top of the rack making sure the cartridge is firmly fixed in the rack.. 2 Suck the ink into the syringe and pull out the air. Then stab the syringe hard into the rack from the bottom. 3 Vertically stand still the syringe and the cartridge, then hold it upright as shown in the picture. Press gently downward allowing the ink filling into the cartridge. According to the volume of the cartridge, repeat steps 2&3 until it is fully filled. 4 Do not take out the syringe after the cartridge is fully filled but shake the syringe pole slowly to pump out excessive air inside. Some ink will be sucked out and it¡¯s normal then detach the cartridge from the rack and it is ready to use. 5 If you ate not going to use the refilled cartridge for a while, you may fix it on the other side of the rack to protect the print head and avoid ink leakage from the cartridge. Caution: 1 Refill your cartridge once it is used up to avoid print head dry out 2keep it incool place and keep out of reach of children 3 This patent has been registered we also have other model such 8101/8102/8103/8104 for different ink cartridge.