ULTRA-PLUS Chrome Plated Prong Collar with Center-Plate, 2 O-rings and Assembly Chain (3.0 mm x 24 in / 60 cm) Herm Sprenger : Bull Terrier Harnesses, Bull Terrier Muzzle, Bull Terrier Collars, Bull Terrier Leads, Dog Leashes, Prong collars for Bull Terrier, Pinch Collars for Bull Terrier, Spiked Collars, English BullTerrier Muzzles