Glass Mount Suction Cup Sign Holder. Sign frames-this Message/Holiday sign frame is one of our most popular displays! This suction cup sign holder is great for displaying your printed 8 1/2" wide by 11" high literature or holiday signs back to back on glass doors or in windows. Double-sided so Customers can see your message while passing or coming in and they can see a different message when leaving. The 8 1/2" by 11" sheets are held securely in place and are easily inserted from the top or sides. The holiday sign display can remain mounted to your glass door or window while changing messages. The suction cups are field tested and proven to hold in all climates. On Sale 8.99 any Quantity