Made from a , long lasting grippy polyurethane and rubber compound that 't mark up indoor rink floors and is perfect for rough, outdoor surfaces like streets and sidewalks. Offers precision and control with cushioned, sturdy use. Installation is a breeze - you only need one screw for fastening! Designed for plates that secure the toe stop with a 5/16inch (8mm) bolt. The hardness of these stoppers is 82A. These stops have no unintentional drag or slide and will stop on a dime if you're precise enough. Colour: black white mixed color Material: PU Size: 47 x 34mm Package Contents: 2 x roller skate stoppers 2 x screw bolts 1 x screw driver Only the above package content, other products are not included. Note: Light 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.