MGT 4-in-1 Comb Black/Teal Fine head (40 pin):? 3? wide head, teeth are 3/4? long, 16 teeth per inch. Coarse head (30 pin):? 3 1/2? wide head, teeth are 3/4? long, 10 teeth per inch. Ultra-coarse head (33 pin):? 3 1/2" wide head; 17 long teeth are 3/4? long, 16 short teeth are 1/2? long;? 11 teeth per inch. *This style of comb is often referred to as ?moulting? or ?shedding? comb. The differing lengths of pins allow the removal of much more undercoat. Combo head:? 3 7/8? wide head, teeth 3/4? long, half coarse 7 1/2? pins per inch, half fine 11 pins per inch.