Through collaboration with the best MXGP teams, STM has achieved maximum performance after an evolution of research and development. 1 aluminium (light) 2 aluminium and steel (light and durable) 3 skeletal steel (+ light + durable) The new innovative design introduces a new concept of clutch: more barrier for lubrication of all components and easier disk slip. The famous springs STM allow a better startup than the currently clutches on the market. This drum/non-tambour reaches maximum innovation with the SKELETOR CLG.