ring-spring snap,snap fastener,metal snap button,garment snap brass/ferrum OEKO-TEX standard 100 OEM service customized --ring-spring snap,ring-spring fastener,snap button,garment snap button,metal snap button.ring snap,kinds of nap tops.--brass/ferrum--Nickle free, Lead free,Azo Free,Rust free.--OEKO-TEX standard 100 --OEM service--customized size and color