... glass, the transmittance rate reached 99%, not broken, no radiation,strong brightness, high hardness, with no scratches for many years, ... white,) color fluorescent mark pens (8 color is optional if you need)specificaton of our led fluorescent writing board :- Eye- ... long life span, recycled, repeatedly written3. Erase easily with the soft cloth and without any trails.4. Strong abilities: anti-windy, ...