EconoSpace Art and Glass Separator 1/8" 100 Ft Bundle 20, 5 Ft Pieces - Black Professional looking - No painting. Neutral pH - No plasticizers - Won't harm fine art. Cuts easily & clean with razor or shears. .005 Inch neutral pH acrylic adhesive. (Adhesive is 250% thicker than the others). Hollow for stiffness & lightness - doesn't tend to sag in the frame.