These convenient kits contain everything needed to evaluate dialysis membranes for your application. The small roll is also ideal for low volume projects. Spectra/Por 1 through 3 Standard Grade RC Tubing Dialysis tubing available in a range of nominal molecular weight cut-offs (MWCO) for less specific separations. Spectra/Por grades 1 through 3 are packaged dry with 10% glycerol and contain trace levels of heavy metals and sulfur. Whats Included: 5 m roll of Spectra/Por dialysis tubing, 1 standard Spectra/Por Closure, 1 weighted Spectra/Por Closure, and 5 opening picks.