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The Earliest Earplugs Were Invented in Europe. It Is Said That Scottish Fishermen Use a Wax Earplugs to Resist the Dangerous Beauty of Sea Decadent Music. The Earliest Earplug Products Also Originated from Europe, and Wax Earplugs Are the Most Traditional Materials. It Can Be Softened by Hand and Made into a Shape Suitable for Meatus Acusticus. But the Disadvantage Is That It Is Not Hygienic, and Wax May Remain Within Meatus Acusticus, Which Is Not Easy to Clean. and My Ears Will Feel Painful after Wearing It for a Long Time. Later, Due to the Continuous Research and Development of New Materials, an Elastic Material Gradually Became the Mainstream of Making Sound Insulation Earplugs, Which Is Polyvinyl Chloride (PVC) Foam Sound Insulation Earplugs with Slow Rebound Characteristics.Slow reboundAfter the Earplugs Are Rubbed into Blype by Hand, They