Kimble kimax solution bottles these kimble kimax bottles are designed for storage and dispensing of solutions. Bottle necks are standard taper ground to accept flathead color-coded ptfe stoppers manufactured from 33 expansion, low extractable borosilicate glass conforming to usp type i and astm e438, type i, class a requirements. Warning: this product can expose you to chemicals including tetrafluoroethylene, which are known to the state of california to cause cancer. Prop 65 warning