A roof system includes a closure that opens a roof opening in a vehicle. In a preferred embodiment the spacer layer is comprised of CuOx. The rolling assembly has a first resilient member 18 interposed between the rolling cylinder 5 and its piston rod 15. The electric circuit includes a power supply, such as one or more batteries, and the circuitry necessary for producing or reproducing a desired sound. In another example, the automated testing system includes a multiple degree of freedom stage for aligning a sample testing location with the instrument.