- Ceramic (Si3N4) balls are smoother and rounder than steel balls - less friction and more speed
- Ceramic balls are harder than steel balls, last up to 10x longer and won't corrode - deep groove races made with premium Japanese SUJ2 chrome steel
- Ceramic balls are 60% lighter than steel balls and nylon ball retainer is lighter, quieter & faster than a metal cage
- Labyrinth seal defends against dirt & debris to extend bearing life
- Pre-lubricated with Sonic Super Gel - remove non-contact rubber seals for easy cleaning