Standard board
The boards adopt enamel or baking finish or environmental protection surface. It is endurable, smooth and easy writing easy wiping. The frame adopt aluminum alloy which is beautiful and firm. The bottom board adopt great zinc steel sheet which is wet-proof, bearing corrosion. The plastic interpolative angles adopt ABS system. Assembling handicraft is designed invisible looking modern and professional. The crossing is solid, artistic and unaffected. Besides, the special design is invisible lattice board for teaching to reduce using implement of drawing, saving the teaching time and improving the teaching quality.