Overall Size Fits neck size
32 cm / 12” 9-1/2” - 10-1/2” 24 - 27 cm
37 cm / 14” 11-1/2” - 13” 30 - 33 cm
40 cm / 16“ 13” - 14-1/2” 33 - 36 cm
45 cm / 17“ 15” - 16-1/2” 38 - 41 cm
50 cm / 19“ 16 - 18” 41 - 46 cm
55 cm / 21“ 18” - 20-1/2” 46 - 52 cm
60 cm / 23“ 20” - 22-1/2” 51 - 57 cm