RRP S3M Drive Belt Set for Yokomo 870c 91 Works Re-Release RRP-001WRX. 
Our S3M timing belts offer a durable wear surface ideal for competitive RC racing. Featuring a round tooth profile and a high torque design, providing reliable power transmission by minimizing slippage during operation.
Specifications:
489-S3M-4, teeth: 163
201-S3M-4, teeth: 67