I broke one glass nippleshield so I can only pump one at a time. My nipple is a little brown 1/2" button and after pumping for a while I've got half my areola distended into the 40mm tunnel. Sometimes I tape around my nipple, behind it to make them stick out about an inch. The tip of my nipple is the most sensitive, the light touch of my fingertips exquisite. I love my tits.