Distinguish between your oxygen (blue), nitrogen (green), regulator and octopus (yellow) hoses. Good for using with students to help the students learn quickly the different hoses and their uses. Hose wrap also protects the soft rubber outer jacket from cuts, nicks and abrasions. This 3/8" size 50" (127cm) Long Hose Wrap is longer then most standard hoses for Easy-Trim to Exact-Lengths-Required. Made from Durable Non-Corrosive Plastic, are Easy-to-Install.