Steel Boned Underbust Corsets Black Steel Boned Underbust Corset Spicy Lingerie Authentic steel boned underbust corsets Page 2 Corsettery Authentic Sophisticated Double Steel Boned Underbust Corset In Black Blossom. This is a dark green velvet underbust corset with four front buckles, steel rivet trim, and a curved top edge that sits just below the chest. You lace into this and the room shifts. Ten spiral steel bones and five steel busk closures hold you locked in all night, no rolling, no slipping, no readjusting mid set. The kind of piece you plan a night around.