Penn Control+ - Tennis Ball Case grommets The Gamma Pro-Plus Hopper is

The Gamma Pro-Plus Hopper is excellent for teaching/training

you have lost 10% of the tension

One replacement grip

absorbent and comfortable

Penn Control+ - Tennis Ball Case grommets The Gamma Pro-Plus Hopper isIdeal for advanced beginning players ages 9+ who play on a standard 78 tennis court. The Control + ball reduces speed by 25% for greater control and longer rallies. With premium high visibility felt for exceptional durability, the Penn Control+ ball is also enjoyable for adults who require a slower playing tennis ball. All Penn QST products are USTA and ITF approved and endorsed by the PTR. 3 balls per can 12 cans 36 balls