Not as smooth, they are a bit lighter, certainly different material, they are spinning overnight in the purple brew. Will know more tomorrow. If not up to color by tomorrow then probably will look at the purple nose bombs for mars from LG, see how bad a match those will be. Though the picture looks sort of blue, they really turned out good, a very nice purple, though I have no IH rubbers to compare, but I think it will work for my violet crater build. Waiting on the return from Chris, shouldn't be long. Thanks for asking my friend!