These convenient kits contain everything you need for smaller dialysis experiments or evaluating dialysis tubing for a dialysis application. The small roll is ideal for low volume projects. Spectra/Por® 1 through 3 Dialysis Trail Kits are 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.