Vertical wires from Porcelynne:
You are not able do coordinate the wires size according to the colour on the tip in the front as they change from time to time.
This is a heavy gauge 1/8 inch wide by 1/16 inch thick. These are nylon coated underwires. The colored ends indicate the center front of the bra.
This is a heavy gauge 1/8 inch wide by 1/16 inch thick. Vertical wires are straight up on the ends. Regular wires have a 1/2 inch spread at the top. These wires are ideal for replacement wires in larger cup sizes from F through K.
The Vertical Underwire is generally used on larger cup sizes for an omega shaped bust. The wires are narrower than the regular underwire, but longer. Not all manufacturers use the recommended wire sizes, so check measurements carefully. If you are still unsure of which size you might need, you can order various sizes and return whichever sizes you don't end up needing.
Not all manufacturers use recommended sizes and styles, so please check the measurements against any wires you are replacing. If you are making a custom bra for the first time, we recommend purchasing 3 wires - one that is recommended and once size up and down from the recommended sizes