It is expensive and time consuming to have your tank cleaned for use with nitrox. Once normal air is mistakenly used with it you must for safety reasons have it cleaned and serviced. Don't let this happen to your Nitrox dedicated equipment. Have Nitrox Tank Sticker installed on all your cylinders used exclusively for Nitrox diving, and there will not be a costly mistake made. XS Scuba's Nitrox Cylinder Sticker is built-to-last made from durable vinyl with easy-to-read layout in Nitrox green and yellow colors. This 25.5" x 6" (64.8cm x 15.2cm) sticker will not peel off in water with use and is designed for cylinders with 5.4" to 8.0" (13.7cm to 20.3cm) diameters.