Package Includes: * BUNGEE STRAP COLLAR ; 11.5inch - 27.5inch * BUNGEE LOCK * 3-SCREWS * 2-D-RINGS Minimum size of the Bungee strap is 12 inches. How Does it work? * The bungee strap might seem too short/small for some of you with a large dogs- Although, this is the nature of the bungee technology. * The strap does not have to cover all your pooch neck all around -While the elastic cord is meant to finish the job & ensure sufficient contact of the prongs with the dogs skin. No matter how dense-fur dog you have.