Coastal Pet Products DCPHS21018 18-Inch Steel Herm Sprenger Medium Dog Chain Training Choke/Collar with 2.5mm Link Herm Sprenger dog training choke/collar excellent is for gentle control Made of medium weight highest quality steel material Consistent quality control and superb craftsmanship make it superior It results in easier and faster training for both the dog and the trainer Measures 18-inch overall length and 2.5-mm diameter link