Spitfire Formula Four Lockins 52mm - 101D

Size: 52mm
Hardness / Durometer: 101DU — very hard for fast roll and easy slides 
Shape: Lock-Ins — asymmetrical design with conical outer edge and straight inner wall for locking into grinds
Material: Formula Four urethane — high abrasion resistance and flatspot resistance
Performance: Fast, durable wheels with predictable slides; ideal for street, rails, and ledges