that's breast shield. i bought Avent Band. I bought it becoz my nipple was hurt during the first 3 weeks by my baby. the shield will separate the hurt nipple with bra to reduce the pain and let the nipple recover soon. now i use it for collect the milk leakage come from one breast when i am direct feeding my baby on the other side.
try Bebe Dream or Eugene Club (i don't know how to write chinese of this shop name, it's the chinese translation of Lotus).