Have fun playing with family, friends, or dogs anywhere with these pressurized tennis balls. Made of natural high elasticity rubber covered with extra duty felt, the 2.5″ balls provide excellent bounce height and reduced shock. Compatible with tennis ball machines, the balls are great for playing tennis with humans or fetch with pets. Add a brand name, logo or message to create a wonderful promotional gift or giveaway! Orders of 5,000 pieces or greater are eligible for sea shipping.