DESIGN FOR:The bike cassette bike freewheel set is designed for 8 speed bike, compatible with Shimano. 8 speed cassette is suitable for chain ring between 11-32T. PERFORMANCE:Bike freewheel set freewheel cassette sprocket teeth speed with hollow out design, compare with other freewheel cassette in the market, it reduces much weight to lessen the burden of long time cycling. EASY TO USE:The freewheel speed cog teeth speed freewheel can promise smooth rotation of chain. Easy to install and use. Good accessory for cycling lovers. MATERIAL:The bike speed cassette bike speed freewheel is made of high quality steel material, which is high strength, anti-rust, non-deformation, wear-resistant and durable. GOOD PERFORMANCE:Speed freewheel 8 speed cassette bike freewheel set high precision thread ensures close connection with the bike hub and smooth operation. Providing fast riding speed with less effort needed, reliable to use, applicable to mountain bike freewheel. Specification: Material: Steel Color: Shown as picture Applicable for Bike Chain Ring Range: 11-32T Suitable for Shimano Size: Approx. 13 x 4.5cm / 5.12 x 1.77in Weight: Approx. 305g Package List: 1 x Bike Freewheel Set