At 4-1/2 inches in diameter, the Scalp Massager is perfect for stimulating blood flow and balancing sebaceous glands. Made from all-natural rubber, it’s firm enough for a deep massage but gentle on sensitive skin, helping to promote healthy hair growth without pulling out hair. Ergonomic Design for Healthier Hair: Unlike plastic or metal, our rubber massager won’t scratch or irritate your scalp. Increased blood flow helps your scalp remove dead roots, making room for new growth—a natural part of the detox process. Read more below.