Meet the requirements of various venues, ideal for tennis ball machines, tennis practice, or even playing with your pets There is a newer model of this item: KEVENZ Professional Tennis Balls, Highly Elasticity, More Durable, for Competiton and Training, Pack of 12 $19.99 ($1.67 / Count) (738) In Stock
https://www.amazon.com/KEVENZ-Standard-Pressure-Training-Elasticity/dp/B07PJN1RKX