I have never used boning in a garment before. I ordered 1/4" boning, as the pattern directed. I got the package marked 1/4" boning, and it is very nice -- except for one major flaw -- it is actually 1/2" wide. The boning itself is 1/4" wide, but it is encased in fabric, making the total 1/2" wide.
When cut, this boning does not require tips. Flexicurve boning: lightweight and flexible plastic, 1/2" wide. It is able to flex around the curve of a supportive garment meant to fit the torso. Flexible enough to wear with comfort, flexicurve can be used for a corset, bustier, or strapless garment.