Ideal for post-operative hand, finger and wrist rehabilitation, grip strengthening and for wrist, forearm, thumb and finger exercises. You will receive the set of 3 exercise discs (each one a different resistance) so as your rehabilitation progresses, you can move onto the next resistive disc without having to purchase another one. Colours & Strengths: Light Resistance -Yellow Medium Resistance - Green Heavy Resistance - Red Size: 24cm