Pigeon Mother's Touch Peristaltic Nipple, Size M Set of 2. I used 8 nipples in rotation for about 3 months. After each use, I washed and sterilized them with steam. There are no noticeable scratches or stains, but please understand that these are used items before purchasing. When shipping, the tips of the nipples will be compressed. Thank you for your understanding. I am also selling a set of 4. Discounts are available for bulk purchases.