Wheaton boston round, glass bottles, 500ml or 16oz clear, 28-400 finish. (16 oz bottle, type iii clear, pp cap, ptfe liner) 16 oz clear glass bottles, pp cap, ptfe liner. Clear type iii soda-lime glass ideal for solvent, chemical or sample storage packaged in convenience packs with caps attached to maintain cleanliness polypropylene caps with choice of liners 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