1.Material and Size: you can choose the right size according to different parts of the body. The different diameters of each glass massage cup are about 2.2 inches / 5.5 cm, 1.4 inches / 3.5 cm, 1 inch / 2.5 cm, 0.4 inch / 1 cm. Designed with high-quality glass and silica gel, it is suitable for medical treatment and application. 2.Widely Used: Silicone cupping cover is suitable for face, back, thigh, arm, leg, and other parts; beauticians, massage therapists, doctors, bodyworkers, athletes and even athletes all rely on the high-quality silica gel and glass vacuum cupping treatment equipment. 3.Function: Glass cupping massage increases blood flow as suction is applied, so oxygen and nutrients can be delivered to the skin cells easier. Helps to increase blood circulation, reduce fine lines, smooth skin, refine pores, improve and stimulate collagen, elastin, lymphatic drainage, fluid drainage, and facial contour. Facial cupping stimulates the production of collagen which will help redefine your facial contours and restore poor muscle tension. 4.Best Facial Cupping Kit: It includes four different sizes of cups, the smallest can be used for small areas such as the eyes, the medium can be used for the neck, cheek, and so on. Large ones can be used for body parts such as arms. When using, hold the part of silica gel to exhaust air, and then suck it on the skin. Use your skincare products for 10-15 minutes a day. I believe you will see the effect after a month.