Red & Blue Ruled Dry Erase Boards, Two-Sided are great for teaching and practicing fundamentals at the early learner stage. Bright white board contains 5 sets of blue headline and broken midline plus red baseline format. Each line set measures 1.125" with .375" of blank descender space between sets. Back side is plain white dry erase. Boards feature a high-quality, non-ghosting write-and-wipe surface with smooth, rounded edges and corners. Hardboard backing will not warp or chip. Measure 12" x 9" x 0.125" thick