Case Pack of 4 21x27" Acrylic Magnet Memo Board + Magnets PopsterPlus 21x27" floating display frame is large enough for 18"x 24" posters and prints, this innovative acrylic frame lets you change your display again and again. A single, diamond-polished panel of 3/16" acrylic exhibits your piece, and our Impressively Strong Magnets hold it in place. These magnets are powerful enough to hold up to 10 pages per pair - wow! Hangs in portrait or landscape orientation. Curious about how to hang it- watch this 20-second video: Includes: * One 21" x 27" high-quality polished single panel of acrylic * 4 easy-install silver wall mounts with screws and anchors (0.6"w x 1.5" L) * 8 Impressively Strong magnets (4 pairs) * Lifetime warranty Check out transit times for this product here. Clean acrylic panels with a soft, dry, lint-free cloth, or dish soap and water when needed. Do not use glass cleaners or spirits, which can dull the surface.