Moster, automatic Door Drop seal is designed to deliver perfect sealing performance, preventing air leakage, dust, and contamination in controlled environments. Made from high-quality aluminum housing with a flexible neoprene or silicone gasket, this seal automatically lowers when the door closes and retracts upon opening—ensuring consistent airtight efficiency without floor friction. Ideal for pharmaceutical, healthcare, and laboratory clean rooms, it supports energy efficiency and hygienic control.