Bones Wheels unique formulas are solely developed and produced in their very own manufacturing plant located in Santa Barbara, CA. Using drastically different physical and engineering properties for each formula, BONES creates unique urethanes for specific applications of skateboarding. Features: Abec-6 bearings. 4 x bearing spacers. Sticker and instructions included. Single, non contact, removable rubber shield. High speed nylon ball retainer. Pre-lubricated with Speed Cream racing lubricant. Skate Rated clearances, tolerances and lubricants.