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Its material is stainless steel.This item is made entirely by hand soldering.No chrome plating and No nickel plating. Just hand-polished. It was close by magnet. Color: silver Function: Super Strong Magnetical Scrotum Stretchers, it is better functionality than the lock and more convenient for operation. A:internal diameter 30mm,thickness 10mm; B:internal diameter 33mm,thickness 10mm; C:internal diameter 38mm,thickness 10mm. S- 80 grams, M- 84 grams, L-95 grams.