"Having recently looked at and replaced most of my safety gear to include a box of these. I just spent the most comfortable afternoon possible sanding woodwork with the electric sander, just followed the instructions, squash um up stick um in and wait for the world to go almost silent. After reading reviews of other ear plugs and my dad saying "They don't work you know." I was pleasently surprised. I could hardly hear the sander, combined with decent face mask etc, I could of carried on all day doing a job I normally hate. I wouldn't want to re-use though."