Collections cups for leaking breasts while breastfeeding! These are not pumps or suction enough to pull milk out, they are just meant to collect milk when breast leak wether you put them in when nursing to catch & collect letdowns or just wear them about your day in your bra when not nursing if you are someone who leaks often! Note some moms find suction with the lady bug I feel it can do both! Suction didn’t really work for me so better to catch for me but maybe not for you LTKbaby LTKbump