This chewy is a good sensory tool to allow children and adolecents to improve their self-regulation, concentration, to calm down or reduce their stress. Made of silicone, non-toxic, free of BPA, phthalates, cadmium and lead. * For hygienic reasons, this product cannot be returned. ** Frequently inspect the product to make sure no part is damaged. Do not use if damaged. In order to maintain the function of the clasp, do not allow the child to nibble at the clasp.