A very popular set of two Nagerun training tools, from youth baseball to high school baseball. Imato Method by Yasuyuki Imato. Please check the photos and purchase only if you are satisfied. "Using Nagerun (Nagerun) instead of a ball in practice prevents injuries and helps you master more ideal pitching and throwing." M (5g) Size: Length 50cm / Weight: 125g ● After mastering the correct form, build powerful muscle strength. ● Best for upper elementary school students to junior high school students.