Size of collars: medium 30 inch 35 inch 20 inch 16 inch 37 inch 32 inch 21 inch 40 inch 34 inch 18 inch 14 inch Small 25 inch 36 inch 38 inch 27 inch 17 inch large 24 inch 29 inch 19 inch 23 inch 15 inch 26 inch 31 inch 39 inch 28 inch 33 inch 22 inch
Use: Police/Military K9 training Walking and daily use Search & Rescue For working dogs Obedience training Training All weather