It looks like you're referring to the Avent Natural Nipple size 3M+ (1 piece) by Philips Avent, a popular baby product designed for bottles.

Key Features:

✔ Size 3M+: Suitable for babies 3 months and older (medium flow).

✔ Natural Shape: Mimics the breast for easier switching between breast and bottle.

✔ Anti-Colic Valve: Helps reduce air intake to prevent gas and discomfort.

✔ Soft & Flexible: Made from silicone for a comfortable latch.

✔ Compatible: Fits most Philips Avent bottles.