15 Sets Brass (nickel free) Ring-Spring Snap Fastener Button &ldquo;F3&rdquo; Celtic Triskel 14mm, Finish: Copper-Antique, Strenght: Light Ring-Spring Snap Fasteners 14mm (System F3) Material: Brass (nickel free), Finish: Copper-Antique Design: Celtic Triskel Range of use: strong fabrics, leather goods Strength of Fastener: light (bracelets, light leather wear)