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. These wires have a narrower grade but are ideal for omega cup shapes. This wire was developed with Madalynne Intimates.
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