Caliber specification: wide caliber
Shape: Arc
Material: Glass
Features:
1. Specially designed small round holes for newborn babies, slow speed and anti-choking
2. One-way anti-colic valve, physical pressure-sensitive air return, reduce air bubbles, and drink milk smoothly
3. The design of the leak-proof card slot on the top of the dust-proof cover, does not leak

4.55mm ultra-wide mouth design, easy bottoming, clean and transparent at your fingertips