TMS Automatic Door Bottom/Heavy Duty/Surface Mounted/Clear Anodized Aluminum/36" Long High quality mechanical construction (Tested to 5 million trials) - Made in the USA! Tight seal to stop - sound, light and smoke. Fire rated Automatically raises and lowers with opening and closing of door (no batteries or electricity) Smooth open and close - Won't get caught in floor Heavy duty neoprene sponge seal (not cheap vinyl)