"Criminal" r188 bearing

Full ceramic(ZrO2), 10 ball, PTFE cage. 

fairly smooth, fairly quiet with a glassy, constant pleasant feedback. 

Rust proof, No metal! 

Easy to clean, blow out or rinse and allow to dry. 

NOTE: Careful! Full ceramic bearings are inherently brittle, they cannot absorb a shock load (drop) without shattering.