New Standard Compatible Game Ball / Softball 12-inch (Old Size 3) Naigai Certified Ball 1 Dozen / Softball Game Ball Rubber Ball Junior High School High School General 12 Balls NG-136701 naigai-12-1d New standard starts from Spring 2026! Get used to the 12-inch ball a little earlier. Starting April 2026, softball balls (old Size 3) used in junior high schools, high schools, and general play will switch to the new standard 12-inch size. These are Naigai certified balls that comply with the new standard. The basic specifications for diameter, weight, and rebound height are the same as the old Size 3 balls, but the seam height has been changed to 0.8mm, improving grip and spin stability. The seams are closer to those of leather balls, realizing a realistic grip and stable rotational performance. Since there are differences in hitting feel, grip feel, and reaction during defense, it is important to start practicing early to get used to the "feel of the new ball." As these are officially certified balls, they can be used for practice as well as for official matches from the 2026 fiscal year. Recommended for those who "want to play without feeling awkward in the actual game" and "want to get a feel for the new ball early." [Brand Name] New Design Naigai Softball Certified 12-inch 1 Dozen (12 Balls) [Product Number] NG-136701 [Size] Circumference 30.48±0.32 cm [Weight] 190±5g [Seam Height] 0.8mm [Color] White [Notes] ・12-inch ball (old Size 3) ・Certified ball by (Public Foundation) Japan Softball Association