Antrader 4Pcs M10 Thread Adjusta... vs Tahikem Plastic Shims 8 Pack Tab...

Bought them to support 400lb cnc. Used on a sleep number adjustable base. We move the controller around every once in a while, and it's extremely heavy.

Simple, well made commodity item with no significant defects. They are pretty inexpensive, at about $1 each. Thankfully, where there's a need there's usually a product.

They are grippy with each other, so you can double them up and they won't slip off of each other. They have nice deep grooves to hold them in place, and i feel like the grooves and the semi-soft plastic will keep them from slipping.

They're not jarringly obvious when in use. They are translucent and kind of a thick almost gummy bear like consistency.