Powerball is a trademarked name for gyroscopic exercise devices produced by Nanosecond (NSD): later patents for the Powerball device cover its extra features such as rev counters and gyro-powered LED lights.
Powerball is a trademarked name for gyroscopic exercise devices produced by Nanosecond (NSD). Later patents for the Powerball device cover its extra features such as rev counters and gyro-powered LED lights.