Bones Swiss Ceramic Skateboard Bearings 8 Pack Eight-pack of premium ceramic skateboard wheel bearings with four bearing spacers, instructions, and a sticker Cerbec ceramic balls are light, hard, and strong for a long lasting performance Precision-grade Swiss design and manufacturing acclaimed for 25 years Nylon ball retainers and Bones Speed Cream lubricant for a sustained ride Skate Rated for better performance than any ABEC rated bearings; lifetime warranty against manufacturing defects