The Disk-Invest Boxes contain round bars. The round bar is a disc with a diameter of 18 to 55 mm, which is the next step above the rectangular bars. It has the advantage over the standard medium edged Osmium bars that the maximum number of individual shapes can be cut from it when it is processed. In the circular shape, the ratio between edge and surface is geometrically most favourable in order to produce as little offcut as possible. Offcut refers to areas that cannot be used when Osmium is cut and objects are positioned on the round bar. The box contains the maximum number of round bars for the advertised value, as well as medium edged bars, diamonds and stars until the total is reached. This box is interesting mainly because round bars are included, as the round bar is not subject to surcharges for processing or cutting. To adjust the quantity of goods to the price, a little more Osmium is delivered free of charge in addition to the oversupply. Those who wish to receive round bars or Disk-Invest-Boxes and already have medium edged Osmium bars can also exchange those bars for round bars free of charge as part of the round bar purchase.