The clutch bell racing on diameter 107mm to the manufacturer's RMS for Minarelli engine (MBK Booster, Nitro)
It is identical to the clutch Malossi Wing bell old model, the only difference is that weight is much less. Indeed, it weighs only 500gr instead of 750gr for the Malossi.
This bell has a reinforcing flange to cool down with the variation a maximum!