Natural & Eco-Friendly: Made of 100% natural cork, chemical-free and sustainable. Multi-Part Application: Relieves muscle tension in shoulders, neck, back, legs and feet. Unique Hardness: Medium-firm texture balances effectiveness and comfort. Portable Design: Tennis-ball sized duo, fits easily in bags for on-the-go use. Safety & Reliability: Durable food-grade cork, ideal for adult daily therapy.