This is a Mugen 2.8mm rear anti-roll bar, and is intended for use with the Mugen MBX6 and MBX6T 1/8 scale vehicles.

Effects of Rear Roll Bar Adjustment

Stiffness	Characteristic
Softer	Increased Rear Chassis Roll Increased Rear Traction Decreased Front Traction Decreases On Power Steering (May Cause Understeer)
Stiffer	Decreased Rear Chassis Roll Decreased Rear Traction Increased On Power Steering (May Cause Oversteer) Quicker Steering Response in High Speed Chicanes