A production method comprising the step of charging prepolymer, a foaming agent and an active hydrogen-containing compound in specified amounts into a tank and foamingmixing them for a specified time by a mixer, and the subsequent step of pouring the mixture liquid into a metal mold. The flakes can be formed from metal oxide materials and have a number average longest dimension of greater than 60 \u03bcm. The second antenna is not connected to the first antenna at any points where it intersects the first antenna, but rather is inductively coupled to the upper and lower halves of the first antenna through mutual inductance regions. The client tools may be enriched with services. In accordance with the invention, the damping device includes a damping chamber formed on the return side, that is subjected to the system pressure acting on a pressure port. Due to the latter property, the counting method can advantageously be implemented in the form of embedded software that relies on a relatively small, fixed amount of memory.