Herm Sprenger Chrome Plated Training Collar with Quick Release features HS Scissor Snap that allows fast release of the dog. Herm Sprenger training collars are designed so pressure is spread evenly around the dog’s neck. The ends of the links are carefully rounded to provide safe correction. Herm Sprenger Training Collars are manufactured in Germany from the finest quality of materials and craftsmanship. The snap also enables the collar to be easily fastened around the neck. The collar must be fitted correctly in order to work properly, fitting just below the dog’s ears. Links may be added or removed to make a comfortable snug fit. Attach the lead to the "D” ring at the top of the collar. These Quick Release collars are available in 4 sizes: Small 2.25mm, 16” neck, maximum weight 44 lbs; Medium 3.0mm, 21” neck, maximum weight 88 lbs; Large 3.2mm, 23” neck, maximum weight 88 lbs; Extra Large 4.0mm, 24” neck, maximum weight 154 lbs. All collars have a limited guarantee against breakage, tarnish or rust.