The shimano dura ace st 9070 di2 shifters ensures that choosing the best gear for the riding enviroment is super easy and precise giving you the performance you require when you demand it the shifters are made from a combination of materials to create the perfect blend of strength and light weight performance with carbon fibre lever blades carbon composite bracket body and a titanium clamp band you will never be left disappointed by the work that is put in by this shifter several