3M Ear Plugs, 30 Pairs/Box, E-A-R Classic 310-1060, Uncorded, Disposable, Foam, NRR 29, For Drilling, Grinding, Machining, Sawing, Sanding, Welding, 1 Pair/Pillow Pack

I've used these ear plugs in the past when I had a noisy room on vacation. They're not the most eco friendly, as they're disposable, but you can reuse them a few times. And if they're too big, you can cut them down to make a more comfortable size.