I purchased 2 sets of these chairs ($400 later). After I used for the first time, the bearings fell out on all of the chairs. I tried to work with the manufacture to replace or refund and since it was longer then their 30-day (so generous) return policy they told me I could either return them, on my own dime, to New Jersey or California, when I live in Pennsylvania. Very poor craftsmanship for bearings to fall out with one use. Do not buy these chairs!!! Company also very rude to work with on phone!!!