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: Plastic Ink Color: Red/ Black Item 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 * 1.5in Package Weight: 25g/ 0.9oz (Inner Diameter: 3.4cm) 23.4g/ 0.8oz (Inner Diameter: 4.4cm) Package List: 1 * Time Clock Ribbon