Wobble Wedges Rigid Plastic Shims, 30 Pack - Multi-Purpose Shim Wedges for Home Improvement, Work - Plastic Wedge, Table Shims, Toilet Shims, & Furniture Levelers - Black Leveler Wedges, Leveling Feet

I bought these to stabilise a washing machine, which sits on an uneven floor. Three of them stacked has worked perfectly - the washing machine no longer dances noisily across the floor. I'm very happy indeed. They're tiny and unobtrusive (which really isn't important re the washing machine, but might be if they're being used for, say, a dining room chair or a side table).

Can be used individually or stacked together as they won't slip. I've used them on cupboards and dining table and they work well

I whent on their website and found out that this is a common solution for gym equipment/machines. They are much smaller than wedges commonly used in construction but the way they're designed they did their job. We have our machines sitting ontop of painted uneven cement so quite a few would wobble. We used to put black mocrofibers and they would work but looked tacky. I needed 2 max for some of the machines on one side. The design is amazing regarding them stacking and staying in place. Easy to use and I used about 6 total and used them on 4 machines. Took about 5minutes total. So far im super happy. As long as they dont slide out or anything we're good.

These are perfect for that wobbly table. So much better than those bits of folded card!

Needed shims for a water fountain and these worked perfectly. They have locking groves so they can be stacked without slipping.