Double Sided Sign, Magnetic/Dry Erase Steel, 14 1/4 x 22 1/4, White, 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.