Pacific Flyers Premium Ceramic Si3N4 Silicon Nitride Skateboard Bearings / Set of 8

Pack of 8 premium ceramic skateboard wheel bearings Superior precision G5 silicon nitride Si3N4 balls used in construction Double, non-contact, removable rubber shields for easy cleaning and less friction Pre-lubed with the highest quality synthetic lubricant for the smoothest ride Far better performance than any ABEC rated bearings; lifetime warranty against manufacturing defects A pack of 8 SiN4 skateboard ball bearings at a bargain price! The balls in each bearing are made of precision grade 5 silicon nitride to offer superior performance. The shields are made of rubber, and the housing is of chromium steel. They have all been pre-lubed with the best quality synthetic lubricant to provide smooth operations always. These skateboard wheel bearings come with a lifetime warranty against manufacturing defects.