What is the duro? What is SPF? Are these wheels any good?
Bones is wheel company of George Powell, ie Powell, Powell Peralta. They are one of the few independent wheel manufacturers in the world. Powell pioneered urethane wheels and is still on of th best wheels on the market.
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.
Basically these grip better on slick surfaces, they dont flatspot, and are the perfect hardbess for skateparks.
Wheel Core No
Wheel Diameter 60mm
Wheel Hardness 84B
Wheel Formula SPF
Wheel Color Red
Wheel Suggested Use Skateparks
Wheel Surface Smooth
Wheel Shape P5