Higher rubber content provides a better bounce. Add air to increase the bounce and add variety to a workout. * Thick walls increase durability and extend the life of the ball * Textured surface allows for a better and more comfortable grip even during the most strenuous workouts * Bold colors and easy read weight stamps allow for quick identification of weight desired * Includes full color instruction sheet * High rubber content with a textured surface provide a better bounce and a more comfortable grip^Add air to increase bounce and add variety to your workout^Thick walls increase durability and extend the life of the ball^Bold colors and easy read weight stamps allow for quick identification of weight desired^Includes full color instruction sheet