Wheel Hardness 84B = 104a. Wheel Shape P5. Tony Hawk - T Bones. Available in 58mm. Wheel Formula SPF. Set of 4 - Pro Skateboard Wheels. 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.
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