Provided herein are compositions, processes and kits for noninvasive, early determination of fetal sex from, andor amount of fetal nucleic acid in, an extracellular nucleic acid sample from a pregnant female. An imaging magnification of at least one of the variable refractive power elements increases during zooming from the wide angle end to the telephoto end. A method of making the bushing includes the steps of a) forming an inner core of silicon nitride or silicon carbide; and b) applying a ceramic matrix composite material over substantially all of the inner core. The flexure fitting is detachably attached to the substructure, or fuel tank of a vehicle.