Bones Skatepark Formula (SPF) is 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 has a high resistance to abrasion while not compromising hardness and slide ability.

56mm x 36mm, 81B (like 101A)

The P5 Sidecut shape features sidecut walls designed for more stability, less drag, and longer grinds.