Material: medical-grade liquid silicone (LSR).
1. Using cold runner precision injection molding;
2. Passed the ISO 10993 biocompatibility test；
3. The soft and elastic silicone material can naturally conform to the contours of the face, achieving a pressure-free fit; 
4. Resistant to aging and easy to disinfect: It can withstand various medical disinfection methods such as 121℃ high-temperature steam and ethylene oxide (EO). It maintains its elasticity and sealing performance even after repeated cleaning and disinfection. It is not easy to yellow, become brittle or deform, and has a long service life.