Ideal for offices that print colour business documents and marketing materials. HP 646A Yellow LaserJet Toner Cartridges keep your business productivity high. Original HP print cartridges with HP ColorSphere technology deliver consistent, professional colour on marketing, financial, design and engineering documents.Compatible Printers: HP Color LaserJet Enterprise CM 4540 Series, HP Color LaserJet Enterprise CM 4540 MFP, HP Color LaserJet Enterprise CM 4540 fskm MFP, HP Color LaserJet Enterprise CM 4540 f MFP, HP Color LaserJet Enterprise CM 4500 Series