Herm Sprenger’s Neck-Tech design features a stainless steel collar with each part stamped from solid coiled stock. This unique design imitates canine teeth & allows the collar to have a more natural "bite” during the correction pull. Nylon billets with a safety buckle. The links of the Neck-Tech are called “elements”, and may be used to adjust the collar length by 1.25" . Available sizes: 19" or 24"