The material is brass on the round plate and titanium for the post. Comes with rubber PT-1 for piercing. Please use the parts with adhesive and use. Cancs with a wire diameter of 1.0 mm or less can be used for cans.Pierced sheetIf you insert it into the post and use it, you can cover your ears from a round plate that touches your ears. * Because it is an accessory, the color may be changed by incorporating the trendy change. In the processing process, shades of colors may occur without notice. Please note. (Depending on the parts, there may be a variation in color with other parts.) * Titanium is a metal that is hard to cause allergies, but rarely can cause metal allergies even in titanium. Please be careful when using it.