Earring hooks made of stainless (or surgical) steel suitable for allergy sufferers. The hook is terminated by a spring, has a length of 20 mm, a width of 21 mm, the thickness of the metal of the hook is 0.8 mm and the eyelet for the thread has a diameter of 1.5 mm.
The stainless steel (surgical) alloy of the afro hooks from which they are made is referred to as SAE 304 (also known as A2 stainless steel, or 18/8 stainless steel). In addition to iron, as the main component, it usually contains around 18 % chromium and 8 % nickel. Detailed information on the composition and properties can be found at English wikipedia.
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