product description:
Description: Wrist ball doesn t need battery, it is powered by rotating the wrist, all you need do is to increase the speed by making a rotational wrist movement and the speed of rotation can reach up to 12,000 R.P.M. The Forceball can generate between 1 and 30 pounds of resistance by spinning at almost 12,000 rpms.
The faster you spin, the harder your muscles exercise. and when you spin the LED lights inside the ball will be flashing.
Package include: 1x Forceball with LED speed meter
1x Starting rope
1x Hand strap
1x User manual
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