Карандаш Белый ствол (102а-)

Got patent on this new practical model and appearance, with patent numBer200720303327.1,200730358735.2. It has no the shortcoming of planning, sharpening and breaking of pencil lead of wood-made pencil, while it has the function of erasure. The practical value of erasable ball pen is more than 7 wood-made pencils. It has stability and wear-resistance with stainless steel and copper pen-point. The length of mark line exceeds 800 meters, far surpassing the state standard of 500 meters of the same kind product. The ink used is high polymjer which could be erased between 5-10minutes after it writes. The ink is high and low temperature resistant and prevent from discolor and deteroration, while keeping the function of normal writing and erasure. The handwriting will become permanent in 5 hours. Recently the content of As, Ba, Cd, Cr, Hg in ink has passed the safely inspection.