Topspin Pro Replacement Ball family-boost Style #: CZ6125-100

Style #: CZ6125-100

comfortable fit with bungee material and velcro strap

this is a softer version of Hyper-G that offers the advanced player with a full swing a more arm-friendly string that maintains the spin and bite of the original

Their hard plastic and symmetrical holes are an industry standard and they are used for many USAPA tournaments including the US Open up until 2019

As Gamma says

Topspin Pro Replacement Ball family-boost Style #: CZ6125-100This is a replacement tennis ball for the Topspin Pro Tennis Trainer. This does not include the other accessories necessary to install the ball into the trainer and so if you just need a replacement ball, this is the product for you.