MRSLOTCAR 18mm 36T (36 Teeth) Ergal Lightweight Sidewinder Gear for 3/32" axles. This gear is used for sidewinder setups where the motor shaft is parallel (or nearly so) to the rear axle. "Ergal" is a trade name for 7075 aluminum alloy.
MRSLOTCAR part number MR6236R.
Package contains one (1) sidewinder spur gear.