The Eggsercizer is an egg-cellent hand therapy exerciser that works on increasing grip strength. Its unique shape is designed to fit the contours of your hand to promote recovery from injury or surgery. Use the Eggsercizer for a variety of exercises for the fingers, hand, wrist and forearm, and also as a stress reliever. Your patients can improve grip strength, hand endurance, dexterity, muscle tone, and fine and gross motor skills with repeated use. The Eggsercizer is made of a non-allergenic polymer that will not crack, leak or melt. This is the 4-piece set of Eggsercizers ranging from orange (x-soft) to purple (firm). Begin with the peach exerciser for an easier hand therapy session before increasing resistance to the firmer Eggsercizers.