Single-stage flywheel, also known as single-chain wheel flywheel, is mainly composed of outer sleeve, flat block and core, jack, jack spring, washer, wire block, steel ball and other parts.

Sprocket is a kind of wheel with cogged sprocket, which is used to mesh with the block with accurate pitch on the chain link or cable. Sprockets are widely used in chemical industry, textile machinery, escalators, wood processing, three-dimensional parking garages, agricultural machinery, food processing, instrumentation, oil and other industries. The bicycle sprocket is made of high-strength steel to ensure that it reaches the required tension.