This Smaller gauge cannula (3.10 mm) allows easy insertion, and is Optimal for nulliparous and multiparous collars with narrow or deformed cervix. Featuring a Circular tip that prevents damage to the uterine wall, Insertion System for loading and unloading, No cervical dilation is necessary for placement in most cases, Less contact surface (only 2 points) in form of 7. It comes in two sizes (Std and Mini), for use in uteri with histerometría 7 and 5 cm. respectively.