Magnetic identification panels are designed for use as an accountability system.

The base magnets adhere to the helmet, while the "outer" panels are 3½" x 2¼" and come in black or white. Reflective lettering comes in a variety of colors and can be configured a number of ways. The panels are interchangeable for various station assignments. 

Note: Magnets with letters and numbers are available, here.
Helmet is available separately.