BICKLE KNEE SLIDERS are made from a very hard material with a very low coefficient of friction. This allows the puck to last longer and give better feed back to the rider. The slider does not grab the tarmack but allows your knee slider to be placed and slide over the asphalt without catching. We've also added a slight curve as most suits today have knee and shin armour. This helps the puck to make contact with all the attaching velcro. Bickle Knee sliders are hand made.