The Sensor Ace is a precision instrument made in Japan with airtight chestpiece machining and a ball-bearing flip over mechanism. This instrument was one of the last superior stethoscope produced before Japan exported its manufacturing to China in the early 1990s. The airtight machining is crucial to sensitivity and professional quality. The only difference between the Ace and the Sensor-Spectra is that the Ace has a hidden spring binaurals. You cannot see the spring, it is inside the "Y" tubing. The Sensor-Spectra has the spring strip outside of the tubing. The difference is cosmetic only. Includes two pair of eartips (white plastic, soft rubber mushroom). Handsome Gray or Black tubing. Regular pricing was $29.99 Specify color choice in =COMMENTS= on order form.