F4 101D Conical Full Skateboard Wheels PENNY Union Binding Company is the

Union Binding Company is the pioneer of Mini Disk technology

Carve Pack Inserts: Allows a more centered stance option for riding firm snow

Reinforced hems

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F4 101D Conical Full Skateboard Wheels PENNY Union Binding Company is theConical Full Shape The Formula Four Conical Full skateboard wheels feature Spitfire's performance urethane that lasts longer and withstands more abuse than the competition. Pick which duro you're looking for after assessing the varying attributes, 'cause this is getting technical. Spitfire Duro 101 The Duro 101 by Spitfire is harder of the two durometers, they will be faster in a skatepark than the 99Duro wheels, but are also more slippery. They will