Our existing stock of this series of buttons are all 20mm, but we can also customize other sizes according to customer needs. The buttons are all made of resin material, which has better high temperature resistance and corrosion resistance than other materials. The buttons are hand-sewn by needle and thread, and the sewing method is relatively simple. One of the buttons is very distinctive. It uses a combination of black and purple design. The button has a little purple on it. This design method is very unique and attracts people’s attention.