A cellulose based selectively permeable material in tube form which can be used to demonstrate osmosis and dialysis separation techniques. Retains molecules of molecular mass; 12-14 x 10.Molecular weight cut off (MCO) 1200-1400 Daltons.14mm diameter.30 metre lengthVisking tubing is also known as dialysis tubing. It should be stored in a re-sealable polythene bag to retain moisture.