Polypropylenkil

Settling a wobbly workbench took about ten minutes with these — the polypropylene held its shape under pressure without any splintering, which my old wooden shims never did. They’re thin enough to stack for fine adjustments, and they’ve stayed put in my garage for weeks now.

Finally, shims that don't crack when I'm adjusting a door frame—the polypropylene has just enough give to seat evenly without splitting. I used them under a wobbly workbench leg and it's been rock-solid for two weeks now.

The polypropylene material holds up way better than the cardboard I used to jam under furniture—these shims don't crush or split when I tap them in with a hammer. Worked perfectly for aligning my workbench legs and they're thin enough to stack for tiny adjustments.