Sunrace

• 12-speed Fluid Drive wide-range mountain bike cassette• XD interface• The largest cogs (42T and 50T) are made from heat-treated 7075 aluminum for maximum strength and durability with minimal weight gain• 10?12?14?16?18?21?24?28?32?36?42?50T cogs offering a 500% gear range• Aluminum stars and lockring• Color: black chrome• Weight: 560 g