40D. Bought this for a specific dress. Wasn't expecting much, but I did expect the wires to be at least as sturdy as a standard bra. The only wire is the "u" wire in the cleavage. Because of where it is on the body it tends to flip upward. There is little to no support from the cups and breasts are not held in place very well. Probably ok for a smaller chest, but busty ladies should look elsewhere. Seems decently constructed and measurements are accurate.