The aluminum bar has a polyolefin foam cover so it wont hurt or fear when hit. The bar is split in the center and bends freely, so it disperses the impact of the main body even when hit so it wont easily fall over. In addition, even if you are hitting a beginner or unplugged foot, the bar can bend freely, reducing the risk of falling and reducing the fear of your practice. The height can be adjusted to 4 different levels, so you can change the height to suit your level, use it for hard training, jump training, etc.