Hypodermic Needle in Glass Tube The clear glass tube, featuring a cotton stopper, contains a hypodermic needle. This needle is made of steel and features a push fit into the detachable port, which was meant to be push-fit on the syringe. The needle itself is engraved with the number 20, indicating the size. Some cotton was placed inside the glass tube. Signs of wear and tear are present. 1900-1949