This is an extender bra hook that allows you to adjust the underbust size of your bra. It stretches, so it's comfortable even when you move. This is a convenient item that allows you to adjust the size when your weight or body shape changes. It's economical because you can continue to use your bras even if your size changes. Please use it as an underbust hook or underhook. Set of 3 Size: Approximately 10cm wide, 3.2cm high 2-row, 3-hook Center spacing between hooks: Approximately 1.2cm Colors: White, Black, Red, Gray, Pink, Beige, Skin tone, Dark Red, Blue You can choose 3 colors you like from the photos. Please let me know your color choices before purchasing. If you purchase without specifying colors, you will receive 3 pieces: black, white, and red. No discounts, please. This elastic type is available in 3-row, 4-row, 5-row, and 6-row. Please comment if you would like one.