This is a genuine black toner cartridge from OKI, compatible with various models including C530dn, C531dn, MC362, C330dn, C331dn, MC361, MC561, and MC562w. The unit type is a unit, and it comes with a California Prop 65 Warning. The manufacturer warranty is none. The toner cartridge is suitable for use with laser printers, and it is an original equipment manufacturer (OEM) product. The item length is 3 inches, the item height is 3 inches, and the item width is 8 inches. The unit quantity is one, and it is made in China. This toner cartridge is perfect for those who want to produce high-quality black prints with their OKI printer.