Aluminum flywheels are are very robust and can take a great deal of abuse. However, durability comes at a cost and due to the heavier weight they will take longer to reach maximum rpm. But if you want high fire rates, a heavier wheel has more momentum and will push the balls without the sudden rpm changes associated with light wheels. Accompanied with our Sunny Sky brushless motors, our 3 hole mounting design prevents slippage between the flywheel and motor. Along with the secure mounting, our flywheels have a low center of gravity which keeps vibration to a minimum.