These are two 10" rubber wheels with bearings in the wheels. The wheels come with 30 tooth L series timing belt pulleys mounted to the wheel, qty. 2 20 tooth L series timing belt pulleys, qty. 2 L series 0.75" wide 50 tooth (18.7" outer circle) timing belt, and idler shafts.
Performa wheels offer the advantages of both hard and soft tread materials in a single wheel. Like a hard tread wheel, Performa rolls easily and is very durable. Like a soft tread wheel, it rolls quietly, protects floors and resists impacts with a cushion ride. It also features maximum weatherability, low temperature flexibility, resistance to chemicals, water and steam, and rejects floor debris such as metal shavings. Non-marking thermoplastic elastomer tread is permanently bonded to ribbed polyolefin wheel core.
Use these roll pins to fix sprockets to a shaft and keep them locked in place.