The Bones Wheels Skatepark Formula™ (SPF) is very high-quality urethane specially formulated to resist flatspotting on slick or smooth surfaces while maintaining a higher rebound for a quicker response and a faster roll. Simply put: The Skatepark Formula wheels grip better on slippery surfaces, are almost impossible to flatspot, and are the fastest, longest lasting wheel on the market today.
Bones have spent over 25 years making skateboard wheels. These days, Bones have superior urethane technology for 100 percent less flats pots. Slide when you want it, and grip when you need it.