These collars are 1.5″ in width and are martingale style. The buckle hardware for this width is very large and best for large dogs or dogs with long necks like greyhounds. 
Starts with a strong but soft webbing core in a width to match the collar width
Encloses the webbing entirely in either crepe- or flannel-backed satin for body and softness on the neck
Is securely sewn using industrial strength nylon thread on industrial sewing machines
Finished with top-of-the-line hardware