CollarSafe "Basic Replacement Collar - Big Dog 1.5 inch Extra Wide - Fits Most (not All) modules for Your Dog's PetSafe & Other Brands, Wireless Containment, Electric Fence, Training/bark Systems 1.5 inch EXTRA WIDE for your BIG DOG & adjusts up to 30 inch length (easily customizable shorter, see included instructions) TWO large adjustment buckles keep collar TIGHT!!! These are NOT traditional dog collars and DO NOT have "D" rings or any metal which may interfere with RF signals Fits MOST (not all) 2-hole Receiver Modules that measure approx 1-3/16 inch on center Polypropylene Basic Webbing - approx .066" or 1.68mm thick - 900 lbs tensile strength - UV, water & stain resistant Custom Designed and Made in USA by CollarSafe - Eco-Friendly features minimal retail packaging