TriForest Erlenmeyer Shaker Flasks are manufactured with virgin, optically clear, non leaching LEXAN? Polycarbonate resin that retains clarity after gamma radiation. The flasks are certified pyrogen free, DNase/RNase free, ideal for cell cultures, microbial cultures, plants, media preparation, storage, and all related applications. They fit all standard shaking incubator clamps and can be placed on any platform.