HP CE255X Compatible Toner- Black . Compatible with CE255X, 55X - Black. Fits Models: LaserJet P3010, P3015, P3015D, P3015DN, P3015N, P3015X, P3016, LaserJet Pro M521DN MFP, Pro MFP M521DW, LaserJet Enterprise 500 MFP M525DN, M525FN, LaserJet Enterprise Flow MFP M525C