Lightweight Full Core Striker wheels are really worth the sin. The wheels are made with a diameter of 110 mm and a width of 24 mm. The wheels weigh less than 230 grams and the inside of the core is hollow . The hardness of the wheel is 88A. The wheel is made of high-quality 6061 aluminum . There are standard ABEC9 bearings in the wheels. You will find 1 piece in the package .