RX BEARINGS MGP-75 Hybrid Skateboard Bearings

MATERIAL COMPOSITION - 1 Ceramic balls is silicon nitrate (1500+ HV7) 6 Steel balls are 52100 carbon, chromium steel (HRC 67) Inner and Outter raceways are 52100 carbon, chromium steel (HRC 67) Retainer is 6/6 Nylon + special additive making it more resistant to breakage Pre-lubricated with Rx Lube Drops®, a low viscosity oil to reduce friction

TOLERANCES - ABEC-7 rating, Ball deviation grade 5, Noise is under 31db.

DESIGN FEATURES - Balls are highly polished to a mirror like finish Inner and outer races are highly polished to a mirror like finish Raceway is optimized for the ball and raceway contact area and contact angle. Removable non-contact rubber shields for easy cleaning and zero friction.

LIMITED WARRANTY - 2 Years