I hate using plastic unnecessarily so when someone recommended these pads to me I was hesitant. I usually buy large packs of wood spacers and they work well. But recently installed windows and got a pack of them and they've been amazing. Very well constructed to hold up under pressure and very easy to break off any protruding parts. I have used them on all outdoor projects and any areas that can get wet. I keep the fragments and they will come in handy in many ways - spacers, scrapers, extra padding. Now I carry a few in my build bag. Good product.