GaksiMil Head Set (Membrane & Head) is made from PP (polypropylene)  and silicon. The head is made with PP and the membrane is made with silicon.
 
Cleaning Instructions : Separate the head and the membrane, and place them in boiling water to sterilize for 20 seconds.
 
How to use : Wait approximately 20 seconds after sterilization before use. Fix and secure the membrane onto the head by pressing them together. Ensure the half moon shape on the membrane is on the bottom left of the head.