... Acrylic,ps,plastic *make light box ,LED letter vacuum forming machine for acrylic 1.Do not have upper and lower die ... is more economical;D. Die on simple, accurate, and do super small print, no waste;E. Without mechanical indentation process, so ... convenient.5. Pneumatic door of heating box, energy saving and high efficiency.6. 2 indivicual heating boxes, single work and double ...