The Led Dog Collar Is With High Quality Flat Optical Fibers, Over 50% Brighter Than Others, Keeping Your Dog Safe In The Darkness, And You Will Find Your Pet More Easily, Highly Visible To Car Drivers, Walkers, Joggers, Cyclists, Motorists Etc. Lightweight, Breathable For Your Dogs: This Lighted Dog Collar Is Made Of Heavy-Duty Nylon Webbing Material Which Makes Your Dog Feel More Comfortable, It Also Comes With A Metal D-Ring For Dog Leash Attachment.