Product Size: peanut style: 8*16cm, round shape: diameter 8cm Colour: Black Material: EPP Package content: 1*Peanut massage ball 1*round massage ball 1.THERAPY AFTER EXERCISE both massage balls aid in recovering tired and sore muscles. May also use these massage tools while waiting for your doctor 2.RELEASES STRESS helps relax the muscles especially on back, neck and feet. Can be used as a roller for leg muscles. 3.HEAL FASTER ON INJURIES removing tension and stress that restrict blood circulation is the key to maintaining hydration in your muscles and connective deep tissue. The spike ball will aid on your injury recovery. 4. PORTABLE FITNESS ROLLER our peanut and massager balls are made of high-grade materials. More convenient than bringing a foam or foot roller on your travel. 5.DURABLE FOR LONG PLEASURE: The special material is light as a feather and at the same time extremely robust, dimensionally stable, abrasion-resistant, odorless and insoluble in water. You will have many years of pleasure with your new massage balls.