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Radar Zodiac Roller Skate Jam and Derby Wheels 62mm x 37mm Poly-BD wheel with Turbo metal hub. The narrow foot print (width) of the Zodiac wheel allows for greater range of movement when caught in the pack. The metal hub let's you feel the floor and let's the Poly-BD material grip the floor. Zodiac wheels deliver the very top performance for Derby play.Features- The narrow width of the Zodiac wheel allows for a greater range of movement. It?s superb for derby and jam skating. The stiff aluminuml hub let?s you feel the floor. Featuring 5 precisely designed urethane formulas, the Zodiac wheels deliver the very top performance for any skater and surface.62mm x 37mm- Black=91a sticky (Tile floors or smooth concrete)- Red=92a grip (Tile floors or coated concrete)- Blue=93a tite (Uncoated indoor or tile floors)- Orange=95a firm (Indoor wood floors)- Green=96a extra firm(Clean indoor wood floors)- BEARINGS SOLD SEPARATELY- 8 packs

Durometer Hardness Conversion Table