Packaging Quantity: You will receive 2 hard massage balls, small size 7.5 cm/3 inch (Green), large size 9 cm/3.5 inch (Blue), which can be easily placed in your fitness bag or pocket, providing easy self massage and pain relief. High Quality Material: The foot massage ball buckle is made of sturdy solid PVC. They won't bend and can withstand the weight of any boy. High density massage balls penetrate deep into the fascia to release tension. Easy To Use: Simply lean on the massage ball and use your own weight and gravity to massage the neck, shoulders, back, feet, and muscle joints to relieve muscle pain. The prick ball can relieve muscle tension. Multiple Uses: The massage ball has an effect on the myofascial system, reducing muscle tension, improving blood flow, and enhancing physical awareness. It is a self use tool that helps with rehabilitation and muscle recovery. Widely Used: The ultra hard massage ball will help relieve your neck and back pain, very practical. It is perfect for use in the gym, home, office, fitness center, or for trigger point massage on the go.