Super light medical-grade glass bottle that proven to reduce milk stain compare to conventional glass bottle. High heat resistance of up to 1112°F. Withstand sudden change of temperature range of up to 446°F. Comes with specially designed anti-colic nipple to reduce colic and gas. Bottle is dishwasher safe. Boiling and steam sterilizable. BPA and PVC free. 9/6 oz equipped with cross hole small nipple (0~3M).