[Premium Material]-- Made from durable polyurethane material, designed to provide good grip and speed in all hardnesses and has excellent durability.[Size Diameter]-- equipped with ABEC 9 bearings and spacer, the inner diameter of bearing is 8mm, outer diameter of bearing is 22mm, please ensure if it is the specifications you need becompatible withe purchasing. Bearings and spacers are already installed on the wheel.[82A Hardness compatible with Outdoor Percompatible withmance]-- With 82A hardness, providing balance of grip and softness, these wheels are soft enough that you dont feel every bump, but roll as smoothly as any other hybrid wheel, great to skate on hard or rough outdoor surfaces.[Highlights]-- These softer wheels are better compatible with outdoors because they have more give to allow you to bounce or roll over small sticks, cracks, and rocks. Also a decent options compatible with beginner skaters on slick/hard surfaces because the soft wheel makes the skater fairly slow and steady.colour: blueMaterial: PU+PPSize: 58x32mmPackage Contents:8 x pulleys1 x wrenchOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.