The Duro features a strong split ring attachment instead of a swivel, which is more durable and can withstand heavier pulling than either the Original Micro or the Ultra Micro. Fits up to a 9" neck and weighs less than 1.5 ounces. Comes with 10 removable, hand crafted stainless steel alloy links and imported Herm Sprenger chain. Extra links may be ordered; see chart on 'Add-on Links'. Made in the USA.