25 Dry Erase Magnetic Shelf Labels 4" x 4" - Yellow - 30 mil 25 Pack - 4" X 4" Magnetic Strips with Yellow Dry Erase Front and Black Magnetic Back 30 mil magnet thickness Wipes clean when using dry erase markers Don't be confused by competitors selling regular sign vinyl strip magnets as dry erase. Before you buy - make sure it is a dry erase product Made in USA