Genuine EconoSpace art and glass separators from FrameTek, llc. This spacing product generates 3/8" of airspace. There are 12 spacer strips that are 5ft long per bundle for a total of 60 feet per bundle. Black finish. There is an aggressive pressure sensitive adhesive that is easily exposed by removing the paper backing. Cuts easily with a sharp razor blade. Tips for use: Cut with tape side up. Arrange spacers with top horizontal spacer spanning edge to edge of glass, vertical spacers supporting top horizontal spacer, and bottom horizontal spacer fitting inside the two vertical spacers. Do not pin wheel. Always install on the glazing. Do not place adhesive to inside of the frame. Works best when glazing is cleaned with 50/50 mix of isopropyl alcohol and water. Happy framing and visit frametek.com/instructions for more info.