These cups are made of 304 (medical grade) stainless steel. Teats are made of natural rubber, while caps are made of polypropylene. The cups have a thermos-type ability to keep fluids warm or cold if required.

No aluminium, phthalates, bisphenol-A or other chemicals that may contaminate drinking fluids have been used in the production of these cups.

These cups must be hand washed.