This is an extender bra hook that allows you to adjust the underbust size of your bra. It comes with mesh elastic, which is breathable and stretches, making it comfortable to move around in. 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. Quantity: Set of 4 Size: Approximately 9cm wide, 7.8cm high 4-row, 2-column hook Approximately 2cm between the centers of the hooks Colors: White, Red, Black, Beige Price is not negotiable. We will ship anonymously via Yu-Yu Mercari. Thank you.