Pair of Casa Performance reinforced engine silentblocks. These are slightly stiffer than normal Casa silentblocks and really improve the way the scooter handles. The improvement is especially noticeable on twisty roads or racetracks. The 'Casa Lambretta Race Team' use these and their scooters win races. The only down-side to these engine mounts is the fact that obviously there will be an increase in vibration although this is acceptable.