PortaBoards Dry Erase Music Boards are Portable, Magnetic, and Light Weight. Reversible and Dry-Erase on both sides. Made with GatoFoam cores, these music boards are the sturdiest available. Available in two sizes, large 24″x36″ (just over a pound) perfect for either the MagNotes or dry-erase markers, and small 18″x24″ (just under a pound is great for small teaching spaces. Back of boards are blank for writing space.