This is an upgraded Synergy N7 Clutch Bell Assembly. By going with a much larger diameter over the stock clutch system, the "XL" upgrade clutch will deliver improved holding power on models equipped with high power motors like the YS91SRX, YS96 or OS105 engines, or especially engines that are further modified in some fashion for additional power output. The extra weight of the clutch will also improve smoothness while spooling up the model.
The clutch bell additionally comes with a Clutch Liner pre-installed, and includes a pinion gear.
Needed to Complete: SYN-200-503