Good material: Polyurethane (PU), wheel, reduce excessive abrasion. Durable, stable and quiet to slide quickly and smoothly; 608 RS ABEC-9 chrome steel bearing allows high speed to be achieved. Parameters of the set: wheel - diameter 52 mm, width 32 mm; 608 RS and ABEC-9 bearing 22mm outer diameter, 8mm inner diameter, 7mm width. 95A Skate Wheel: 95A hardness and 80% rebound, hard wheels for playing tricks; good to use on the street, skate parks, skatepark bowl, rink, on ledges, gaps, hand rails and pads, etc. Perfect for most skaters also beginners. Ideal replacement wheels: suitable for many skateboards such as Skateboard Pennyboard Snakeboard Cruiser Board etc. Could also be used for quad roller skates. Good choice as a gift on birthday, Christmas and New Year. Package includes: 4 x 5232mm wheels and 2 x 3mm joints and 8 pairs of 29mm deck nails and a T-tool Picture is for reference only, please refer to the actual product information ! ! ! (excluding roller skate) Product Name: Skateboard Wheels Material: PU Color: Black Size: approx. 52x32mm (as shown in the picture) Mass: approx. 470g Quantity delivered: Pack of 16 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.