The large, grey colored Cool-It Roller combines the natural healing powers of massage and cold therapy to reduce swelling and skin irritation by constricting blood vessels and improving micro-circulation. Use the large Cool-It roller for treating pain and inflammation associated with sports injuries, shin splints, arthritis, and chronic back aches. Stays cold for approximately 60 minutes. The spa-quality roller, with its durable surgical grade stainless steel wheel is available in two sizes allowing you to customize your experience. (See our other listing for Size Small.) Dimensions: 7? Long x 3.75? wide x 2? roller diameter. Stays cold approximately 60 minutes. Back pain and arthritis relief. Additional Details ------------------------------ Package quantity: 1