Chain and sprockets have to work in perfect harmony: this is the reason why we have optimised the profile of the sprocket teeth. The result is perfect synchronisation in traction and rapid shifting thanks to the Ultra-Drive(TM) design.
Steel
Galvanized
Ultra-Drive
Single sprockets
Supplied with lockring 
Optimized sprocket timing 
Ultra-Drive system surface galvanization.
Weight 250g
The nominal weight refers to the lighter specification among the available options.