This product relieves shoulder, neck, foot, lower leg, mid and lower back pain. Perfect for massaging down your spine. The middle groove avoids the spine bones to ensure only the muscle is massaged. The Cork Peanut is best used against the wall for a gentler massage or lay on your back for more intense sensation. The Cork Peanut can be used across and long ways on most parts of the body. It's light weight, discrete and can be used under your desk. Size: 7.3cm x 15cm Weight: 100g