Dr. Brown’s Options+ Baby Bottle Teats, Level 4, Wide-Neck, pack of 2

Consistent Flow Rate : The vacuum-free feeding system mimics breastfeeding, and Dr. Brown’s Fast Flow Teats provide a steady flow, allowing babies to feed at their own pace. Dishwasher Safe : Suitable for top-rack dishwasher use, as well as electric and microwave sterilizers or boiling water.

eBay