Copper balls are used as carriers for the polishing of different horology pieces, preferably soaked pieces like pinions, screws, pull-out pieces, wheels, etc. Liquid compounds are the optimal work bases of the modern techniques of Tribofinishing. Thanks to their high cleaning capacity, they keep the pieces and the abrasives clean and prepare them to any treatment of Tribofinishing. Application: the balls size has to be chosen according to the dimension of the pieces that have to be polished. Abrasive: diamantine ASCO from standard to very fine to be mixed with the balls and the lubricants.