HTGSupply 25 Foot by 4 Foot Reflective Mylar On White Poly Roll, 2-Mil Silver metalized reflective Mylar on white poly liner Construction: Highly-reflective metalized silver side ; white poly backing alternative reflective surface ; heavy-duty, tear resistant 2-mil (.002-inch) thickness Hangs easily using tape, staples, tacks, adhesive, etc. Please Note: This material does not produce a clear mirror image, and thus is not recommended for visual applications in which this quality is desired. Roll measures: 25' long x 4' wide