101.05mm. People who like fitness know fascia guns. As of June 7th, 2022 10 Fascia Gun is a sports recovery artifact all over Shen Jian sports circle, which is used for bodybuilders to relax muscles after exercise. The head length of Xiaomi mini-fascia gun is about 10 1.05 mm, and this millet mini-fascia gun is superior to similar competitors in the market in terms of speed, impact, battery life and charging time.