The wheels are very hard and there is a slight ridge/seam where the two halves are molded together. This caused a dent line in our oak flooring for each wheel when we moved a 150 pound hutch. Lucky for us we noticed this when moving it off our old oak flooring. Hence we did not use them to move it back on the new oak flooring.Very hard to move across carpet. Great for moving across the plywood subfloor.