●【Premium Material】-- Made from durable polyurethane material, designed to provide good grip and speed and has excellent durability. ●【Size & Diameter】-- 59mm in diameter, 38mm in width, equipped with 608RS ABEC 11-bearing and spacer.Bearings and spacers are already installed on the wheel. ●【90A Hardness for Indoor Performance】-- With 90A hardness, providing balance of grip, roll good in slick sport court and wood floor. Suitable Skating Style:Derby skating. ●【Package Included】-- Pack of 8 wheels replacements and installation tool ●【Color Option】-- Come with 5 different core color to match any set of skate