One pair, left and right eartips fits the Yapalong Boom MIC II, Yapalong Open MIC, Yapalong Boom MIC II PTT, and FBIM ear piece (FBIM headsets can only be positioned on the left ear). Provides noise attenuation. No loss of sound volume and quality. Manufactured from a soft medical grade silicon. Easy to install: Simply fit the earbud of the headset into the tip after removing the foam earbud cover. Holds headset in ear securely. Comfortable to wear and simple to clean.