Bones Hardcore Skateboard Bushings Soft Blue (Set Of 4): A turn for the better, the Bones Hardcore Skateboard Bushings are the preferred choice among top pros and alike. Bones patented double action, high rebound urethane provides the best response, turning and feel of any bushing in the world. The Bones Hardcore Skateboard Bushings give you a looser ride, ideal for skaters who like to cruise through life.