The Digital Earplugs MM1000 cut approximately 90% of sound, providing a comfortable environment. - Brand: KING JIM - Model: MM1000 - Noise Reduction: Cuts approximately 90% - Type: Digital Earplugs Thank you for viewing. This is a set of 2. While effectively cutting noise, machine sounds, etc., you can still hold conversations 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. It's very convenient and helpful. Retail price: 5500 yen Also sold on Amazon for 4500 yen.