this is a Prong collar,or a pinch collar(i hate that word) they looks mean but they dont hurt the dog at all.when they pull,it gives them a little pinch and they dont like it,so they know not to pull.it worked very good on Kodie,and he is very storng,and weighs over 90 pounds i didnt want to get it in the first place b/c i thought it looked mean,but it works very good.