Helium 64mm Derby/Rec Wheels

Helium Jam Wheels are specifically designed for roller derby and jam skating, where hi-rebound and good roll are needed in combination with incredibly tight grip. This wheel has properties that are normally not achievable in the one wheel with a design based on a large rigid hub and a smaller, thinner tread. This is one of the tightest, good rolling indoor/outdoor wheels available. The hub is incredibly strong, very light, and has extremely close tolerances for roundness, trueness, and for the cage where the bearings and spacers are mounted. 
 
Indoor/Outdoor High Rebound Wheels
Hardness:   N/A
Diameter:  64mm
Compound:  Cast Urethane Hi-Rebound Compound Formula
Wheel Info:  Hub = Yellow, Tread = Clear
Set of 8 wheels
 
The yellow hubs glow very strongly under “black light”
 
It is almost always recommended to use spacers in the wheels, when using standard 7mm bearings.