1.Material: H65 Brass 2.Nickle free and lead free 3.Oeko-Tex Standard 100 class New Style Spring Snap ButtonCompare with regular prong snap button,the advantage is:1).Designed for automatic fitting machine,special for tip-top prong snap button market.It will show your brand out of the ordinary. 2).After continuous fasten and pulling 1000 times, the pulling of socket and stud nearly not change,and ...