Yokomo Brass Rear H Arm Weight Base 10gYokomo (#Y2 008RW10) Brass Rear H Arm Weight Base 10g Feature: For: Yokomo RD2. 0 SD2. 0 series Brass weight attached to the rear arm. This is an optional part for RD2. 0 SD2. 0 that can be combined with the aluminum Y2 008RAW rear H arm to systematically increase rear traction. By mounting weights on the highly rigid aluminum H arm, it is possible to increase the unsprung weight that is directly applied to the rear tyres, effectively increasing tyre