The Ainu MAM Feel Good is a glass baby bottle in premium guality, it is made of temparature resistant guality glass for easy use every day. Can be heated and cooled quickly, washed in the dishwasher and sterilized at high temperatures. Does not absorb smell, taste or color from food. Large opening for easy filling and cleaning. Ainu MAM bottle teats in 4 different flow rates can be bought seapately. All Ainu MAM products are BPA and BPS free.