The applicable weight of the collar is 15 mm Width: 30 kg / 20 mm Width: 30 kg / 24 mm Width: 75 kg (strength tested by a specialized institution) Please note that the applicable weight is only a guideline and does not necessarily guarantee that weight. Never use on dogs that are extremely strong, have a habit of biting or pulling, or have a habit of running when they see other dogs during a walk. It is only for walking, so please refrain from using it for any purpose other than walking. Since dog equipment is a consumable item, its durability varies greatly depending on the frequency of use and the environment in which it is used. If you see wear spots such as rust on metal parts or fraying sewing parts, replace them with new ones as soon as possible to prevent accidents. It depends on the usage situation, but we recommend replacing it after about 6 months.