Loop Switch Earplugs Multi-Mode Noise Reduction Earplugs BLACK These have been wiped with alcohol before being listed. I used them about 2 or 3 times, but decided I didn't need the switching function for my purposes, so I'm selling them because I bought a different LOOP. You can switch between 3 levels of noise reduction, making them comfortable to use in any environment. Please ask any questions in the comments.