Those uneven and unleveled floors are always a pain in the butt, and if you change your legs for one floor it will be wrong for the next place. This new shim pac will be handy to carry in your seat for a quick fix wherever you may set up, and need a quick fix. These are "interlocking " and will stay together. They come in a set of three, and can adjust you from 1/16 to 1/2 inch. simply swing one away and use two or use only one. The included stainless steel cable keeps them together, and they don't have to be removed to change size needed. Just roll one out of the way or use all three. They are made of strong nylon. These are 5.99 a set and 2.50 shipping.