This 16 tooth pulley should be used on the rear axle, in conjunction with a Slot.it Magnesium or Double Shoulder wheel (e.g. codes PA49, WH1184, WH1186, WH1230), in Slot.it 4WD system.
Due to the fragile nature of the resin used, please use extra caution when mounting this part on the wheel hub. If you feel you are forcing it in place, we advise to warm up the resin gently with a hairdrier before installation.