Made of soft and breathable cotton material with stainless steel hooks.Add more extra room and comfort to bras while wearing your bras is too tight.Easy to use: attach the hooks on your bra, then put on your bra as usual.Specification:Available in 4 colors: black, white, skin color, apricot, can match most bras.There are 3 style: 2 hook, 3 hook, 4 hook.2 hook size: 10(L) x 3(W) cm/ 3.9 (L) x 1.1 (W) inches, spacing between two hooks: approx. 1.4 cm/ 0.55 inches.3 hook size: 10(L) x 6(W) cm/ 3.9