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Black rubber bands. The Electric motor pulley and crankshaft pulley have teeth setup for a gates PowerGrip Timing Belt. But I haven't gotten around to adding the needed tensioner pulley to make it work. If you take you're time and build the model so thats there's as little fiction as possible, the runner bands will work just fine. The biggest cause of friction is from the valves springs. I have some ninjaflex on order that i was going to try and make a timing belt too but the gates timing belt on amazon is cheap enough.