This base model with one ring is safe and easy to apply due to the ClicLock and offers a quick and pinpoint influence on the dog. Herm Sprenger is one of the leading manufacturers of dog training products, best-known for their quality, reliability, and safety. All products are made in Germany, utilizing only the finest materials and components. Through their continuous quality control efforts over the past 140 years, Herm Sprenger’s training collars are recognized as one of the best training collars sold on the market today. * This ULTRA-PLUS Training dog collar is safe and easy to put on and take off due to the ClicLock fastener. * This prong collar allows for more flexibility between the collar and the leash due to the swivel attachment. * It also offers pull limitation on the length of the assembly chain. Sizes Available: * Gauge 2.25mm x 16" (42cm) * Gauge 3.2mm x 23" (58cm)