Pinit POLYESTER (Mylar) Sleeve 11-1/2 x 16-1/2". 4mil. 2" OPEN FLAP. Use for Mini Poster/Early Magazines. SKU: SEMROF (0)No Reviews yet Add to Shopping Cart Details 11-1/2 x 16-1/2" 4 mil Polyester (Mylar) Sleeve Comes with a 2" Open Flap. Use for Mini Posters & Early Magazines. To ensure a flat, even, fold-over ... Details Back Details11-1/2 x 16-1/2" 4 mil Polyester (Mylar) SleeveComes with a 2" Open Flap. Use for Mini Posters & Early Magazines. To ensure a flat, even, fold-over flap, pre-crease flap before taping closed or tucking inside. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review