The invention relates to a sliding element for a shoe sole. The calibration block includes a first metal block bonded to a second metal block. Fine powders produced are of size preferably less than 1 micron, and more preferably less than 100 nanometers. A flow detection system is integrated into a main fluid transport conduit, allowing sensed flow variations to be sent to a controller. In accordance with a second protocol, the network device may modify the data frames before forwarding the data frames to their respective destinations.