Feature: 1. Muscle massage ball is light in weight and easy to carry. Ergonomic design makes it comfortable to hold. 2. Manual massage ball adopt quality stainless steel to inject cold gel to prolong cold therapy. 3. No matter how long it's freezing, this massage ball won't break as easily as an ice pack. 4. The ball stays cold for a long time, and cold therapy can help calm and soothe to make you feel better. 5. Made of high quality ABS and stainless steel, skin friendly and smoothly using experience, comfortable to use. Specification: Item Type: Cold Massage Roller Ball Material: ABS+Stainless Steel How to Use: Ice and hot therapy, as a cold compress massage ball: you can put it in the refrigerator for 2 hours until cool; Use as a hot massage ball: You can place it in a bowl of hot water for 5-10 minutes Suitable Symptoms: Plantar fasciitis, tired muscles, back pain, neck pain, hamstring, shoulder pain, stress relief. Package List: 1 x Cold Massage Roller Ball