For dogs under 6 pounds. Our tiniest collar for very light pullers. The Ultra features an extraordinarily fine jewelry chain and tiny swivel attachment, making it feather light and ideal for very small and toy breeds. Fits up to a 7" neck and weighs less than 1.2 oz. Comes with 8 removable, handcrafted stainless steel alloy links imported Herm Sprenger jewelry grade chain, and welded safety ring. Extra links may be ordered, although we recommend instead ordering the Original Micro Prong if you need a collar for a neck larger than 7". Made in the USA.