Gear differential putty is used to control the differential action of gear diff units used in R/C cars that have sealed gear diff systems. When high viscosity oils are not enough to achieve the desired differential action, the use of putty can become quite handy. The material in this package comes in a roll which can be removed easily from the plastic case, cut into 3mm pieces with scissors and inserted into the differential.

Gear differential putty (25g)
Black plastic case