Mom's Precious bottles are made of Polypropylene, the safest plastic for storing breastmilk featuring the following benefits:

Shatterproof: No cracking and splintering when dropped

Proven food-grade material: 
Designed to retain breastmilk's beneficial properties. Research has shown that polypropylene plastic prevents precious antibodies from clinging to the sides of the bottles.

Bisphenol-A (BPA) Free: 
Safest plastic for breastmilk storage

Materials used for bottles (including the ink) are toxic free (BPA, Phthalates, PVC, Lead, Cadnium and Nitrosamines). Complies with the requirements of: EN14305 & U.S. FDA 21 CFR177.1520