Features:Replacement ink cartridge ribbon is used for electronic time clock machine.With red and black ink color to meet your need.Print clearly and install easily.High quality material, long durability.Two inner diameters (3.4cm/ 1.3in, 4.4cm/ 1.7in) for option, please noticed the inner diameter of your previous one.Specifications:Inner Diameter: 3.4cm/ 4.4cm (optional)Material: PlasticInk Color: Red/ WhiteItem Size:Approx. 6.3 * 6.3cm/ 2.5 * 2.5in(Inner Diameter: 3.4cm)Approx. 6.5 * 6.1cm/ 2.6 * 2.4in(Inner Diameter: 4.4cm)Item Weight:17g/ 0.6oz(Inner Diameter: 3.4cm)15g/ 0.5oz(Inner Diameter: 4.4cm)Package Size: 6.7 * 6.5 * 3.7cm/ 2.6 * 2.5 * 1.5inPackage Weight:25g/ 0.9oz (Inner Diameter: 3.4cm)23.4g/ 0.8oz (Inner Diameter: 4.4cm)Package List:1 * Time Clock Ribbon