HS Vision 8K tennis softballs are designed with both performance and durability in mind. Made of the finest rubber and synthetic materials, these softballs are meant to withstand all forms of wear and tear but are still guaranteed to bounce well on any surface. Their bright yellow color ensures that they are very visible, and the felt covering gives a good grip for players. They are best suited for training and practice. They retain their shape and air pressure for constant playability.