PREMIUM QULAITY OF HP GENUINE BLACK TONER CARTRIDGES YIELDING 10,500 PAGES. COMPATIBLE PRINTERS (IF ANY): HP LASERJET ENT M610,HP LASERJET ENT M611,HP LASERJET ENT M612,HP LASERJET ENT MFP M634,HP LASERJET ENT MFP M635,HP LASERJET ENT MFP M636