The Bones SPF Side Cut Skateboard Wheels are constructed of a very high quality urethane specifically formulated to resist flatspotting on slick or smooth surfaces while maintaining a higher rebound for a quicker response and a faster roll. Skatepark Formula™ wheels grip better on slick surfaces, are almost impossible to flatspot, and are the fastest, longest lasting wheel on the market today - get a set and find out for yourself what the word on SPF is all about.

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