The lenses in Batman's cowl can see perfectly through the smoke.[27] Gas pellets:[28] Similar to smoke pellets, gas pellets are used for incapacitating opponents. Lachrymatory, anesthesia, nerve, and regurgitant agents are deployed by breaking open the capsules. A gas filter in the cowl's nose-piece allows Batman to be around the gas unharmed.[29] Line launcher:[30] A device that shoots out a steel line in both directions making a zip line, or a tightrope to walk on.