The S&S Worldwide No-Bounce Medicine Ball is a durable and versatile exercise tool. It features a molded, one-piece vinyl outer shell filled with sand, making it a great alternative to traditional stitched leather or synthetic leather medicine balls. The ball is designed for various exercises such as throws and crunches, and it measures approximately 5.3 inches in diameter. The 4-lb. size is suitable for users of any strength level. Note that the color may vary.