JSEA Mens Black Stainless Steel Mjollnir Thor's Hammer Pendant Necklace Goat Head Pendant:22mmX30mm);Stainless steel O chain:500mm Stainless steel jewelry is Green Jewelry. It does not contain lead and nickel,Resistance to acid,alkali resistant,anti-fading,hard and bright. Anti-allergy,it won't produce side effect and harm to human body. Vacuum plating:To increase the product's ability to engage in oxidation. More shiny metallic appearance, resisted to rust, corrosion and tarnishing Fine workmanship,full of character fashionable breath Clean with soft cloth.Avoid chemicals;Avoid friction.Take off when sleeping