These magnetic sign holders can be added to any flat surface. The sign frame is easy to install - just peel off the protective paper and stick to your wall, shelf, or any other smooth surface. The convenient lift-up MagaLens® allows you to add inserts quick and easily. This frame features a black trim and will hold an insert that measures 3 1/2"W x 2"H (horizontal). For convenience this frame is sold in a pack of 10.