Magnetic Tapes and Sheets
An alternative to predefined dimensions, when other lengths / widths and small amounts of different colors are desired. With scissors you can simply cut the flexible material to the desired length. Manual marking is done with markers. (Please use permanent markers for use outdoors.)
The magnetic sheets are available in various sizes and colors, can also be easily cut as needed. Self-adhesive magnetic strips come in different widths and are designed to be glued to back plates, warning signs and instructions or other light object to be affixed to ferrous surfaces.
CAUTION: Do not erase and rewrite many times.