Red Dingo Martingale Collar Medium 12 - 16" x 0,7" (30-44 cm), Red Dingo Martingale collar Sizes: Medium : 12 - 16" x 0,7" (30-44 cm) Large : 16 - 24" x 1,0" (41-62 cm) Adjustable Half Check - Helps prevent dogs from backing out of their collar. Webbing - Premium nylon webbing, woven from quality fine yarn for a softer feel. Densely woven edges for maximum abrasion resistance. Exceeds ISO standards for washing and UV colour fastness. D-Rings - Fully welded from solid stainless steel. D-rings will not rust and therefore will not discolour pet"s fur.