Mountain bike hollow integrated crankset,CNC anodized, compatible with 8/9/10/11/12 speed..Chainring:34T single chainring ,narrow wide teeth design,better to prevent chain drop..Crank:104BCD MTB crank arm set ,length 170mm,only can be used on single chainring, Weight : 950gram ..Material:High strength aluminum alloy MTB crankset, strong,durable and lightweight..Package:Include cranks, chainring,screws,please check the size you need before buying.