Double-Sided Arrow Sign, Dry Erase Magnetic Steel, 25 1/2 x 60, Black Frame, Sold as 1 Each Double-sided, indoor/outdoor standing sign with white magnetic dry-erase surface. Get people to stop and take notice. White steel dry-erase board can also be used with magnets. Black frame features UV inhibitors which permits indoor/outdoor use. 18"" diameter base can be weighted with water or sand for stability.