PermeGear stirrers are made to hold our different types of diffusion cells. V-Series stirrers are for Franz cells and H-Series stirrers are for Side-Bi-Side cells. All stirrers are constructed from 1/16” (1.5mm) thick stainless steel. Motors in our stirrers run at 600 rpm in the U.S. and Japan and at 500rpm everywhere else.