Material: Iron and plastic wheel.Size: 3.5 cm x 5.1 cm (1.37 in x 2.0 in).Color options: Black, Blue, Red, Yellow (wheel color shipped at random).This chain tensioner is designed as a replacement part for motorcycles and features an adjustable mechanism to maintain proper chain tension.The construction combines iron and plastic components for and function.It is compatible with various motorcycle models and installs following standard maintenance procedures.The unit includes an antiskid large guide regulator to support consistent chain alignment and tension.