I have several of these that I bought in bulk, but I don't think I'll be using them, so I'm putting them up for sale. This is a new, unopened item. #artisan #アーチザン #マウスソール Excerpt from the official website: The skates use a unique "multi-curve shape." In addition to the rounded shape that prevents the edges from catching, the sliding surface also has a slight curve, a two-stage curve designed to reduce unintended excessive sinking resistance due to uneven weight distribution.