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.