Available for immediate purchase. Please comment for bulk purchases or price negotiations! I used these in rotation with M size nipples for about 3 months while supplementing with formula. I'm selling these to anyone who wants them as spares or to try out! Washed with baby bottle detergent and sterilized with disinfectant. I will ship them with the tips pushed in. (See the photos.) Pigeon Pigeon Breastfeeding Real Feeling Nipple