适用于2020铝型材和双黄点壁球，减震效果还可以

型材需要攻丝，未设置球的固定方式，搬运可能会掉落

Suitable for 2020 aluminum profiles and double yellow dot squash balls, with good shock absorption effect

The profile needs to be tapped, and there is no fixed method for the ball, which may fall during transportation