This is a replacement set of two Arrma 8x16x5mm Ball Bearings, intended for use wit the 6S BLX Felony and Infraction kits. 
 
Features:
Premium ball-raced bearings for ultra-smooth operation in all conditions 
Precision manufactured for fast and easy fit and consistent servicing 
Manufactured to consistent tolerance for safe and secure assembly 
High-quality rubber shields for enhanced protection against the elements 
Keeping dirt, water, and dust out, and lubrication in, means more time bashing and less time wrenching
Specifications:
Inside diameter: 8mm
Outside diameter: 16mm
Thickness: 5mm
 
Includes:
(2) Ball Bearing 8x16x5mm