Anesthetic is required in conducting the experiment with the Stereotaxic Instrument, thus the anesthesia mask is used to match with the anesthesia machine, which prevents the researchers’ exposure to the anesthetic gas. Be together with the Gas Anesthesia Mask, the platform provides precise and secure positioning for mouse anesthesia and surgery. It is installed in the adaptor, with the cone opening toward the open “U”. It is available for mouse and rat.