■ Basic Ball Specifications ■ Weight: 30–31g Diameter: 66±1mm Material: Natural Rubber Color: White ◆ Nagase Kenko Original Valve Air System that is resistant to air leakage ◆ Safe and secure domestic production in Japan (MADE IN JAPAN) ◆ The most affordable model among our soft tennis balls ◆ Recommended for those who are looking for an especially inexpensive ball Since our founding in 1934, we have been committed to manufacturing balls that meet the changing needs of users along with the times and usage environments. We will continue striving to improve daily with the goal of providing balls that satisfy all users. ■ About Air Adjustment ■ Please use the Kenko Soft Tennis Pump (sold separately) dedicated for the valve air system.