Digital earplugs that cut approximately 90% of sound, perfect for comfortable travel and work. - Model Name: MM1000 - Brand Name: KING JIM - Function: Digital earplugs that block sound - Environmental Sound Cut Rate: Approximately 90% cut - Included Sizes: S, M, L Thank you for viewing. While effectively cutting out noise, machine sounds, etc., you can still hold conversations with people without issue. I work in a factory where the noise is intense, but I use these while working, and I can have normal conversations without having to take the earplugs out, which is very convenient and helpful. Retail price: 5500 yen Also sold on Amazon for 4500 yen.