BMC 10 pc Stainless Steel Mixed Design Round Barbell Unisex Fashion Earrings Set Design: Hexagon shaped barbell earrings in various sizes. Size: Smallest hexagons are 4 mm wide, largest are 11 mm wide. Bars have a length of about 6 mm. Material: Stainless Steel. Color: Polished silver and black. Closure: Post with screw on backs.