Internal diameter = 10mm, external diameter 14mm, these strong, surgical steel, rose gold IP children's hoops would suit to perhaps age 10. . What is IP Gold? "To begin with, a layer of titanium nitride is added to the base surface of stainless steel. Additionally a final plating metal is added to the surface; the thickness of this layer is no more than 0.3 urn. ... Given its durability and chemical stability, ion plating is rightly called “permanent” coating."
