The uterine cap (cervical cap) is an instrument made of a flexible metal ring covered with a thin hemispherical rubber diaphragm. With the cap itself and the spermicidal cream applied before insertion, the cap acts as a barrier to prevent sperm from meeting and uniting with the egg, and has excellent safety. The uterine cap (cervical cap) circle outer circle diameter of 50 mm for the 50, other and so on have 50, 55, 60, 65, 70, 75, 80 and other 7 models. Our women generally use 65, 70 and 75 three models. Mechanism of action: Through the uterine cap itself and the spermicidal cream applied before insertion, it acts as a barrier to prevent the sperm from meeting and combining with the egg, and the spermicidal cream can kill the sperm or reduce the sperm’s motility.