Women bra extender sizes: theses bra extender has rows of position hooks (2, 3 or 4 hooks), adjust your bras easily. Ladies bra extension material:Made of soft, flexible, comfortable but sturdy materials. Polyester Fit for most size 2 or 3 hook bra. The distance between the hooks is 1.9cm. Wide Applications:They are especially useful when you have a bra that is slightly too tight on your back. It stays in place well and doesn't come off at all Very comfortable and has saved your money from having to buy new bras.