MAMMOREP® Copan style hook wire breast localization needle set comes in a 20 G, which is V shaped hook, and the 21 G, which is a Z, shaped hook. It is also available in numerous lengths that are measured in centimeters. The marks are easy to read ensuring accuracy in the depth of placement. The well-marked wire allows you to have superior control when placing. The Z shape of the 20 G provides superior secure placement in the mammary tissue.