Check the listing for details. 2 mylars - 15-1/2 x 18-1/2 Size Mylar Sleeves for ORIGINAL ART! Poster Comics cm. Listed at 23.95 USD. I have been selling mylars on ebay for over 10 years now. Go with someone with a proven track record! MYLAR Sleeve(s) - 4 mil Dupont Mylar D® with no flap You are bidding on 2 (two) mylars with a size of 15-1/2 x 18-1/2 inch each. Since they are 4mil thick, they are the ultimate protection for your comic poster arts. Doesn't your collection deserve the best? I am Ebay 10 year seller with over 5,000+ feedback and have sold hundreds of these mylars (along with mylars for Golden, Silver, Bronze, and Modern Comics as well as Mylars for magazines and CGC comics...). I ship FAST and very securely (see feedback details)! ------------------------------------------------------------------------------------------------------------- Mylar®: How does Mylar, which is biaxially extruded polyester film, afford more protection? The poly-bags that most everyone sells are "blown" films, affording very low density and dimensional stability. Mylar is an extruded film that is simultaneously stretched in two directions to give it maximum strength. In fact, it resists penetration by gases, such as oxygen, 300 TIMES more than the poly-bags. As for strength and stability: it is also several hundred times stronger and more stable. Keep in mind, that we are not talking about 4 or 5 times better as compared to their price; we are talking about offering the kind of protection for 100 years which poly-bags cannot offer for even one year. Are the Mylars better to use than the cheaper poly-bags? Poly-bags are acceptable for short term storage while the comics are for sale as noted earlier. But if the storage period is longer and you do not switch to Mylar, then you qualify as DIRECTLY proportional. Advantages of Mylar® Type D Compared to Commonly Used Plastics: Resistance to diffusion of gases like oxygen, Carbon Dioxide, Sulfur Dioxide, etc. is 350 times greater than polyethylene. Permanence. There is no noticeable change in storage-100 years when compared to 2 to 5 years for others. Resistance to moisture, insect attack, fungus, mold, mildew, acid, oils, grease, and solvents is "excellent" compared to "fair" for others. Strength and creep resistance is 10 times that of polyethylene, one-third the strength of steel. Volatile Additions--Mylar® contains no dangerous plasticizers, slip additives, surface coatings, antioxidants, acid-hydrolysis compared to other commonly used plastics. Mylar trademark of DuPont Co. For the purpose of the seller, Mylar shall mean any pure polyester biaxially extruded film such as Mylar D. Mellinex 455, 516 or approved equivalent.