Penn QST 60 Felt Orange Dot 24 Cans The Penn QST 60 Felt Orange Dot 24 can case of balls is geared toward more advanced young players between ages 9 and 10 hitting on a 60 foot tennis court. These balls feature a low compression designed core that allows for the chance to have longer rallies. The bold yellow felt stands out on the court. 72 balls per package. Felt with low compression core. USTA and ITF approved and endorsed by the PTR.