This is the Team Integy 18-Tooth Steel Clutch Bell for the HPI Savage X, XL, 21, 25, 4.6, and SS trucks.  A higher number of teeth on the clutch bell will give you a higher top-end speed.  A lower number of teeth on the clutch bell will give you faster acceleration.

FEATURES
Steel construction, black in color
Tooth number marked in white on the face of the bell for easy identification

INCLUDES
One 18 Tooth Clutch Bell

REQUIRES
Two 5x10mm bearings for installation