The new Primo balance cassette offers reliability and speed thanks to the new larger sealed bearings as well as the driver ratchet! It produces nice sound when the wheel spins. Made of shell from 6061 aluminum. The one-piece driver is chromoly and uses sealed type polymer bearings. The 14mm axle is 4130 chromoly to withstand harsh use. The nuts are made of chromoly. Includes two (2) Nylon Hubguards.
