The main materials are made of mold plastic, looks very beautiful. With switch for rebreath and Non-rebreath, it is more professional for clinical surgery. 

Switch between breath system (circle absorber) and Non-Rebreath(open breathing);

Non-Rebreath, with an alone airway pressure gauge;

O2+N2O Linkage Device(O2+N2O,when use these gas source):make sure O2 concentration is not lower than 25%;