1.Material: 100% non-toxic odorless solid silicone, more safe and clear

2.Size: wide neck for wide neck bottle

3.Color: high-transparent

4.Hole sizes: small, medium, large for round hole and small, medium, large for cross hole

5.Safety: free of BPA, phthalates and PVC, non-toxic and lead-free

6.Temperature: -50 to 200°C

7.Sizes: S, M and L indicates the frequency of air flow:

S: suitable for newborn to 2 months

M: suitable for 2 to 6 months

L: suitable for 6+ months