Robert Baraban Thunder Ball.

A new and unique way to work your fingers and test your grip strength

• 3 inch hollow steel ball

• Smooth surface, nothing to grip...really tests finger strength.

• Use a carabiner to attach the Thunder Ball to a pulley machine.

• Or use a carabiner and chain to attach the Thunder Ball to a weight plate.

• Tough Powder coated finish

• Carabiner and chain NOT included