Material: medical-grade liquid silicone (LSR).
1. Engineering plastic insert injection molding process and the use of cold runner LSR mold system; 
2. Passed the ISO 10993 biocompatibility test.  It contains no BPA, plasticizers, latex or other allergens, is non-toxic and odorless, and can come into direct contact with the human body and medicine;
3. Temperature and disinfection resistance: It can withstand various medical disinfection methods such as 121℃ high-temperature steam, ethylene oxide (EO), and γ-ray. It will not deform or age after repeated disinfection and its performance is stable over long-term use;
4. Strong sealing and adsorption properties