100% brand new and high quality Type:Tennis Ball Material: PU Weight: approx.25g Color: Yellow Diameter: approx.7cm/2.75in Quantity: 1Pc Package Includes1pc Tennis Ball It adopts the highly elastic sponge material, which is lightweight and odorless.It can be utilized for hand grip and finger exercise to promoting blood circulation, relieving stress, increasing hand muscle strength and preventing muscle atrophy.It is widely utilized in the daily exercise and health-care. Perfect for the elder, the mouse hand, ladies, and so on.