15 Sets Brass (Nickel Free) Ring-Spring Snap Fastener Button "F3" 14mm, Finish: Copper-Antique, Strenght: Stronh Ring-Spring Snap Fasteners 14mm (System F3) Material: Brass (nickel free) Finish: Copper-Antique Range of use: strong fabrics, leather goods Strength of Fastener: strong (outdoor, military)