14 mm hidden snap fastener is made of brass material. The product is rust resistant. The 14 mm 26L / 5/8" hidden snap button helps to eliminate the image distortion by keeping the cover (upper part) inside the fabrics of shirts, bodysuits, Jean shirts, baby and children's products. Cup : 16 mm Socket: 12 mm Stud: 10.6 mm Eyelet: 10.6 mm are parts.