This head harness is a size 4. It is made with strong wide nylon webbing. Made with curved black side release buckle and heavy duty hardware. Includes short collar leash. The nose piece is now padded for comfort! Gain control of your active dog. Stops pulling almost instantly. Works on the idea that where the head goes the body will follow. Does not harm animal in any way. Your pet will still be able to bark, drink water etc. Only use while in the presence of your dog. Comes with instructions. FITS MOST~~GREAT DANES, ROTTWEILERS, BERNESE, BULL MASTIFF, NEWFOUNDLAND