HP 91. Printing colors: Pigment matte black Brand compatibility: HP Compatibility: Designjet Z6100. Quantity per pack: 1 pcs Package length: 4.72" (12 cm) Package width: 12.8" (324 mm). Width: 12.8" (324 mm) Depth: 4.72" (120 mm) Height: 2.52" (64 mm)