1Chain roller pulley slider complete with heavy duty bearings ready to use 2This chain pulley roller slider is an necessity for wheel guide, which helps the driving system to function well 3It is made of premium materials for strong strength and long durability 4Comes with several colors for choices. It will match your vehicle chain perfectly 5It is suitable for most of dirt pit bikes, street bikes, motorcycles, ATV, off road vehicles, etc Features: Chain roller pulley slider complete with heavy duty bearings ready to use. This chain pulley roller slider is an necessity for wheel guide, which helps the driving system to function well. It is made of premium materials for strong strength and long durability. Comes with several colors for choices. It will match your vehicle chain perfectly. It is suitable for most of dirt pit bikes, street bikes, motorcycles, ATV, off road vehicles, etc. Specifications:Material: Metal, PlasticColor: Red, Orange, Blue, Green (optional of 8mm) Red, Orange, Blue, Green, Black (optional of 10mm)Inner Diameter: 8mm, 10mm(optional)Total Size: Approx. 32 x 28mm/1.26'' x 1.1''Package Weight: 40-45gPackage Included:1 x Chain Pulley Roller SliderNote:1. Easy to install but professional installation is highly recommended.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3. Please allow 0~1 inch error due to manual measurement. Thanks for your understanding.