The appearance of the diamond model is jewel-like, the design conforms to the ergonomic principle, the hardness is moderate, and the user will basically not feel pain. Moreover, the design of the cutting surface of the diamond model has more obvious effect of touching the skin acupoints and is more convenient to use.

Crescent, that is, spikes, is crescent-shaped, and the effect and pain are more obvious. Not suitable for novices, but for experienced people or people with long-term fitness.