1.servo control precise feeding when running at high speed2.air pump equipped to realized smooth feeding.3.upper glue system adopt cold spray glue system to benefit the gluing.
● Magnetic dry erase green chalkboard for classroom,kids training● Firm 3-Layers board structure and light weight but sturdy ultra slim aluminum frame● Galvanized sheet backing supporting strong magnets● Packing with all spare parts inside one 37.5"x17.5"