NUK BPA-free nipple for baby bottles, size S for 0-6 months. Made of silicone, so it's still usable. This is a valuable older model purchased about 3 years ago, no longer available on the market, but highly recommended by midwives. Made of silicone, so it hardly deteriorates and can be used for a long time. It guides the correct tongue movement, jaw movement, and swallowing technique. - Brand: NUK - Size: S - Target Age: 0-6 months - BPA Free: Yes - Made in: Germany Thank you for looking.