The Half Balls from OPTP are designed for use with proprioceptive exercise and can also allow the user to perform self-massage. Users can stand on the Half Balls to challenge balance, stretch the plantar fascia, and massage the feet. A user can also lay on the balls to target trigger points and other tension. The Half Balls are made of foam rubber with a moderate density, and the product is sold in pairs.

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Source: OPTP