This item is a U Shaped Glass Retaining Spline, also referred to as Glazing Channel. It is typically used with aluminum window frame to cushion and insulate the glass. The product is Gray Vinyl .180" wide x .310" deep and accepts Single Strength (3/32") glass or plexiglass. 200 Ft per roll. Flexible Extruded Vinyl. Easily trimmed to size with razor knife or scissors.