Stereotaxic Frame Nosecone Masks, <70g, model 68601 is manufactured by RWD Life Science Co.,LTD This type of anesthetic masks is specifically designed to fit most stereotaxic frame and deliver anesthetic gases with minimal exposure during surgery. They are locked onto the adaptor with the cone opening toward the open "U”. The animal’s teeth is placed over the incisor bar. Tthe "passive” mask is used with charcoal canister only, and the "active” mask can be used with evacuation apparatus