Build up your strength with the Grip-Strengthening Fidget Ball Toy Great for keeping your hands occupied in a stressful or boring situation Features a steel spring inside as well as a handy strap to hold onto With a built-in elastic device so you can easily control the force Choose from 2 options: with or without light Available in 3 colours: platinum, blue or red Dimensions: 7cm x 7cm x 5cm    Buying Options:  9.99 pounds instead of 29.99 pounds for the Ball with No Light - save 67% 12.99 pounds instead of 34.99 pounds for the Ball With Light - save 63%