Shapeable Aluminum Foil

BlackWrap™, the original flexible matte black aluminum, is form-holding and heat resistant. When wrapped around fixtures or hardware, it keeps its shape and position. On strike night, BlackWrap™ is easy to remove. BlackWrap™ masks light leaks and conceals unsightly cabling. It is ideal for making a snoot or barndoors to control light.

• Masks light leaks and conceals unsightly cabling
• Controls unwanted reflections from shiny surfaces
• Use BLACKWRAP™ outdoors for weather protection
• Ideal for making a snoot or barndoors to control light
• .002 inch thick, coated matte black on two sides
• Available in three widths: 12", 24", 36" & 48"
• Available as a tape in rolls 2 inches x 80 feet

From  http://www.gamonline.com