VWR Cleanroom Paper. 22# Blue, 3Hole Punched. 8.5X11 Polyethylene, Non-Latex, Binding Technology Reduces Paper Fiber. Cleaned And Double Bagged In Class 10 Cleanroom. For Use In Class 10 To Class 1000 Cleanrooms. Excellent Printability And Heat Toner Adhesion. High Opacity And Durablility. Cs2500