wire gauge: 4 mm wire gauge one link adds 1.6 in (4 cm) to a prong collar size link size: 1.85 x 1.25 in (4.7 x 3.2 cm)
Black stainless steel: fully rustproof metal alloy advanced strength and rust resistance for the special electronic processing, that creates its black color suitable for wet conditions contains nickel, so is not recommended for dogs with sensitive skin suitable for dark dogs as may leave marks on light fur may become lighter in use, however it does not reduce rust resistance and strength
wipe it with a wet cloth for a better cleaning use some water, a mild soap, and a brush with soft bristle after cleaning get it dry with a piece of cloth