Add-A-Links add length to the Pro-Training Collar to create the perfect fit for your dog. Gentle, effective control in a patented humane design. Pronged, linked design is gentle but effective in enforcing pack leadership. Helps prevent pulling and lunging behavior. Has appearance of a flat collar. Linked "watch band" design allows for sizing adjustments. 24 per case = order 24. Gentle and Effective. Create a Perfect Fit. Free Training Guide.