Bones Hardcore Skateboard Bushings Medium Yellow (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 are the ideal choice for beginner to intermediate skaters who aren’t sure whether they want a loose or tight ride. Medium Bushings are also perfect for the multi-talented skaters out there who are just as happy to cruise the sidewalk as rip up the park.