All martingale collars are hand made with webbing and stainless steel hardware (nickel plated with a breaking load of 460 kg). They are 1.5” wide (3.81cm) and come in the following sizes:
Small = 13.5” - 15.5” (34 - 39cm)
Medium = 15.5” - 19.5” (40 - 49.5cm)