TheF4 Lock Ins Wheels from Spitfire featureFormula Four urethane making for a fast and smooth wheel with lasting performance. These white wheels featurea101 Duro hardness which are best for street skating.An asymmetrical shape and design with a conical cut profile on one side and a straight edge “lock-in” cut on the other helps lock into grinds.

• (F4) Formula Four Urethane
• Asymmetrical shape and design
• “Lock-Ins” help to stay locked into grinds
• Hardness: 101 DURO
• Longer lastingspeed and control
• 100% true performance urethane
• Set of four wheels
• 55mm in size
• Natural white wheels with colored graphics