Ezclear Erlenmeyer Shaker Flasks Are Molded From Virgin, Optically Clear, Non-leaching Polycarbonate Resin. These Flasks Retain Clarity After Gamma Sterilization, And Comply With Stringent Fda And Usp Requirements. Sterile Flasks Are Additionally Certified As Non-pyrogenic And Dnase/rnase-free, Making Them Ideal For Cell Cultures, Microbial Cultures, Plants, Media Preparation, Storage, And All Other Applications. They Also Fit All Standard Shaking Incubator Clamps And Can Be Placed On Any Platform.fits All Standard Clampssterility Tested To Sal 10-6made From Class Vi Autoclavable Materialsmanufactured In A Class 100,000 Cleanroom Flask Material: Polycarbonatecap Style: Closedcap Material: Polypropylene