the Pickleballs Are Made of High-quality Smooth Plastic with 40 Precisely Machine Drilled Holes Which Overcome Strong Wind Resistance & Create a Balanced Flight Path. Systematically Designed Structure Allows It to Pop Out of the Pickleball Paddle Quickly & More Powerfully. the Pickball Weight is 25g, Diameter 74mm; Hardness. 40d. the Balls Can be Played by Old & Young, Adults & Toddlers, & Beginners & Pro Paddleball Athletes.