Abstract: A roller for a skating device comprising a first material having a minimum elastic modulus of 1 GPa, preferably at least 2 GPa, and more preferably at least 2.9 GPa and/or the maximum elastic modulus of the first material having 10 GPa, preferably at most 5 GPa, and more preferably at most 3.1 GPa.

Abstract: A kinetic section for a skating device comprising at least one ball and at least one roller, wherein the ball is adapted to be in contact with the roller at least at one point or contacting surface; and the ball is adapted to transfer an angular momentum to the roller; and a minimum coefficient of kinetic friction between the ball and a contacting surface of the roller is 0.16, preferably at least 0.20, more preferably at least 0.25, even more preferably at least 0.29 and/or the maximum coefficient of kinetic friction between the ball and the contacting surface of the roller is 0.50, preferably at most 0.40, preferably at most 0.45, more preferably at most 0.35, and even more preferably at most 0.31.

Abstract: A chassis for a skating device comprising at least one retention element comprising at least one of a sliding surface, a barrel-shaped roller, an hourglass shaped roller, a cylinder shaped roller, a bearing ball, at least one ball and at least one turning element.

Abstract: A ball comprising a first material having an elastic modulus of at least E=0.60 GPa, preferably at least E=0.70 GPa and more preferably at least E=0.73 GPa and/or a maximum elastic modulus of E=5 GPa, preferably at most E=3 GPa, more preferably at most E=1 GPa and even more preferably at most E=0.74 GPa, the first material defining at least an outermost section of the ball.

Abstract: A computer system identifies merchandise that has high loyalty at a retailer. The computer system determines a repeatability value of an item in a product category in an inventory at a retailer, wherein the repeatability value indicates how frequently a customer purchases the item out of a plurality of items in the product category. The computer system also determines an exclusivity value of the item, wherein the exclusivity value indicates how frequently the customer purchases the item instead of an alternative item out of the plurality of items in the product category. The computer system further generates a report related to the inventory of the retailer that is at least partially based upon the repeatability value and the exclusivity value of the item.