3 Pack of Bra Extenders - Basic Colors - can easily be hooked onto your back hook and eye closure of your bra. The set consisting of 3 colors (nude, white, black) can individually be used for various bras. Size 12-18 (3 x 3 hooks andamp; eyes) works for our bras with and without formed cups, as well as wire free bras. In sizes 38B-44B/38C-42C/38D-40D/38E. Size 20-26 (4 x 3 hooks andamp; eyes) works for our underwired bras with and without formed cups as well as our wire free bras in sizes 46B-56B/44