• This cassette is a cassette sprocket for 9-speed shift mountain bike 
• It is made of high-tensile chromium-molybdenum steel, and made by the technology of quench-temper hardening, so it has higher strength, durability and has extreme resistance to abrasion. The strong antioxidation makes it hard to rust to have a long service life
• Because of the unique design of the gear sprocket exclusively for mountain bike, you can control the shift function well
• The hollow design can reduce the weight to some extent
• The surface is chrome plating. There is no fading on the plated surface. And the surface of black has a fine appearance and will give you a luxurious feel

Specification:

• Teeth ratio: 11-13-16-20-24-28-34-40-46T
• Material: chromium-molybdenum steel
• Compatibility: mountain bike, HG, hubs
• Weight: 492g