There are rubber plugs on top of each cartridge, remove the plugs to refill and replace after refilling

Features:
1. Easy to install
2. Easy to refill, just use the syringe refill from refill hole, no need special filling tool and special technician. This is the cartridge invention milestone.
3. Transparent Design: Cartridges are clear design so that you are able see how much ink you have put in, and that will reduce leaking. Adopt no sponge structure, avoid break printer head becaus of sponge aging.
4. Innovate it base on the first generation cartridge, make sure no leak ink, print spot, block when printing. Save Money - You can almost unlimited to refill with our refill kits to save your hard earned money
5. The refilling ink hole and the air hole are different. When use the cartridge, Take out the air hole rubber plug.