1.Tennis Balls is made of natural high elasticity rubber covered extra duty felt, with excellent bounce height. Natural rubber construction for high bounce and reduced shock. Our upgraded tennis balls will never lose their bounce , which will offer you endless tennis fun and the good price! 2.Durable & WEAR-RESISTANT BALLS: The durable felt on the Pressurized tennis balls can lasts a long time. They feature a controlled fiber release for consistent nap, more wear-resistant. Our Pressure tennis balls are almost the same as the standard balls, can be used as game balls and training balls. In addition, they're also ideal to use with tennis ball machine 3.IDEAL FOR TENNIS PRACTICE: These highly durable tennis bals are perfect choice for teaching pros, tutors, beginners, as well as avid players as, which can be used in all kinds of lessons & practice. You can play with high quality and consistent ball in outdoor and indoor. Totally blank for autographing and display. 4.Tennis balls are very practical and can be given to friends, family, even dogs, as birthday gifts, Christmas gifts, Halloween gifts, any special days, etc. The ideal way to have fun anywhere and play with your dog or pets! Great for tennis ball machines, tennis practice, or playing with your pets.