This is an extender hook for bras that allows you to adjust the underbust size. It stretches, so it's comfortable even when you move. It's a convenient item for adjusting 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 underbust clasp. Set of 4 Colors: White, Black, Red, Skin Tone You can choose your color. (Although it may be out of stock, please comment beforehand) If no color is specified, White, Black, Red, and Skin Tone will be shipped. Size: Approximately 10cm wide Height: 5.7cm Colors in stock: White, Black, Red, Skin Tone Purple, Pink, Gray, Beige, Dark Red No discounts, sorry. This elastic type is available in 3-row, 4-row, 5-row, and 6-row options. Please comment if you would like one.