Made of stainless steel and plastic, high polished smooth surface metal, rust resistant, can be long time wearing. , Gauge: 16G(1.2mm), Bar length: 6mm 8mm 10mm,ball size: 3mm. These balls can be easily screw up or down. , You can match these balls and Barbells to find your own style; it is economical and worth buying. , 9 pieces steel barbell,9 pieces clear barbell and 36 pieces replace balls in a set; come with one free gift velvet bag. , Simple and elegant piercings for daily jewelry, showing your personality,also can as a gift for Birthday, Christmas Day, Anniversary Day, Valentine's Day etc.