Bones STF Skateboarding Wheels

STF stands for Street Tech Formula. These skateboarding wheels are made by Bones specifically for street skateboarding. Most skateboard wheels are made from urethane, and have a hardness rating stamped on the wheel (95a, or 100a – always with an “a” after the number). STFs are made from Bones’ own unique blend, and don’t have a hardness listed. Instead, they are built specifically for street skateboarding in every way.

Source: http://skateboard.about.com/od/skateboardparts/gr/BonesSTFWheels.htm

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