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 for neck sizes over 9”; see chart on 'Add-on Links'. Made in the USA.