1)Brass or Iron 2)Eco-friendly, washable, Nickel-free 3)Oeko-Tex 100 standard 4)Competitive ... Iron / Alloy2) Colorsnickel/nickel free, anti-brass, anti-copper, gun metal, light pewter, dull-nickel, nickel free dark pewter, nickel free light pewter, nickel free dull-nickel ... Control Oeko-Tex Standard 100 Certification Metal/Brass/Iron/Alloy nickel-free eyelets for garments/shoes/curtains/tents