I put these on a fairly heavy maple top kitchen island and it rolls remarkably easy. THe island is on a thick linoleum type tile floor with no marking or denting issues and i wouldn't hesitate to put these on my hardwoods.
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Pros
Very much satisfied as it arrived on time and it's very stable and sturdyI ll recommend it 100%
Cons
The pack of 4 may not be sufficient for larger projects