Overcast Steel Boned Leather Bustier. Real Leather Steel Busk Boned Corset Heavy Lacing Bustier High quality authentic spiral steel boning corset Made of Vinyle leather, fully lined with 100% cotton. Draws in waist, flattens tummy. Great style for outwear Back lacing with steel front buckles closure. The corset has 14 steel bones to help you achieve that hourglass figure 10 spiral steel bones and 4 rigid steel bones around the grommets for reinforcement for tighter lacing. Bi-directional back lacing cinches inches off the waistline.