SHENZHEN DEVELOPED SOLUTIONS CO LTD. Shenzhen Developed Solutions Co., Ltd is the professional supplier who do the HP caon lexmark/samsung series and we got rich experience on it. First of all, we only use the best materials in field: We use our own new mold cassette, new Japan rollers, new blades, tomegawa toner, and Korea chips all of the incoming materials are tested sternly prior to assembling.Another we conduct very strict printing test for all of our toner cartridges one by one, to ensure the perfect printing result like original ones, dark and even printing, no any backgrould, good fixing, and longer page yield than original.