FUNZON Practice Golf Balls, 25 Pack Plastic Airflow Hollow Golf Balls for Driving Range, Swing Training, Lightweight, Training Golf Balls Indoor/Outdoor Use (White)1, Product Details Material: Plastic Diameter: About 41mm Holes: 26 holes on the surface Sell in Bulk: Set of 25 pcs hollow practice golf balls Function: Light weight, durable, wont bre..