The Think Cup is the perfect solution for introducing children to drinking from cups. Doctors recommend children use cups to drink when they are two years old. The medical grade 304 (18/8) stainless steel interior is wrapped in polypropylene, and is easy to clean. Thinkbaby feeding products do not use BPA, lead, PET, or any harmful chemicals. Handle conveniently opens at the bottom to clip onto a purse or bag for easy travel.