Breast_shell
Breast shells are hollow, lightweight plastic disks worn inside the brassiere to help correct flat or inverted nipples either in preparation for or during breastfeeding. Also known as milk cups, breast cups, breast shields, or Woolwich shields, they can also be used to ease sensitive nipples or collect milk when the baby has not finished the teat.[1] Breast shells function by applying gentle but firm pressure to the region surrounding the nipple to stretch underlying adhesions and draw out the nipple.[2] Nipple shields may be confused with breast shells, but shields are intended for use during the act of breastfeeding, whereas breast shells are worn in preparation for or after breastfeeding.