The float-a-lyzer G2 features biotech grade cellulose ester (CE) membrane. The low protein-binding, ultrapure membrane (no heavy metals and sulfides) is available in nine precise mwcos from 100 to 1, 000, 000 Daltons. The color-coded, re-sealable screw cap eliminates leaks associated with knots, closures, and needle punctures and allows repeated access for in-process testing. The cylindrical tubing geometry prevents sample dilution and provides open access for total volume retrieval with included pipette. The included floatation ring and weighted bottom maintain vertical orientation during dialysis. This design also permits several units to fit in a single reservoir. All sizes are supplied dry with Glycerol in a package of 12. Warning: this product is not approved or intended for, and should not be used for medical, clinical, surgical or other patient oriented applications. Disposable ready-to-use dialysis device eases sample loading and retrieval 95 to 98 percent sample recovery, 99 percent sample purity and <10 percent sample dilution leak-proof screw cap allows easy pipette access for sample loading, testing, and retrieval ideal for dialyzing electro-eluted proteins and chromatography Fractions.