Herm Sprenger TRAINING COLLAR size 16.1"(41cm) STEEL CHROME-PLATED Wire Gauge 0.09"(2.2mm) comfort-plus version with swivel and Sprenger-scissor snap hook no opening of the scissor snap hook under tension more flexibility between the dog collar and the leash through the swivel for dogs with max. weight up to 66 Lbs(30 kg)