Wheaton graduated volumetric glass bottles, 30ml or 1oz, clear, 33-400 finish. (1 oz bottle, wide mouth volume, type iii clear, pp/ptfe liner.) clear, usp type iii soda-lime glass easy removal of contents graduated in ml and ounces ideal for general storage white polypropylene ptfe lined screw cap hazardous communication label included with each case of bottles allows for content id and safety notification. Warning: this product can expose you to chemicals including tetrafluoroethylene, which are known to the state of california to cause cancer. Prop 65 warning