A buff is made from a non-woven fabric where the fibers are first carded and formed into a fairly thick fleece. The throttle body includes a throttle shaft defining a rotational axis, a housing having a bore, a deformable member located on the throttle shaft and at least partially-located within the bore, and a bearing having an inner surface and an outer surface. Additionally, the array of optical shutters may have a default state that is substantially transparent to the demultiplexed signals.