Model：WRT-10 

For use on: 

Lexmark 18C0031/18C0032/18C0033/18C0034/18C0035

Dell M4640/M4646/J5566/J5567

Compatible Cartridges:Lexmark 18C0031/18C0032/18C0033/18C0035/Dell M4640/M4646/J5566/J5567 Attention:The BLACK rubber pad is inserted for the black cartridges.the RED rubber pad is for Magenta.color of color cartridges.and the BLUE rubber pad is for cyan and yellow color of color cartridges.