Westone True-Fit Foam Replacement Eartips - 5 Pair Pack, 11mm Diameter X 14.9mm Length COMPATIBLE WITH ALL WESTONE IEMs: Westone's Star Silicone and True-Fit Foam replaceable in-ear monitor eartips are the best on the market today and are compatible with all Westone's IEMs. 11MM DIAMETER X 14.9MM LENGTH: Designed for narrower ear canals, these foam tips provide maximum acoustic isolation in comfortable, medium recovery foam eartips. As with all Westone ear pieces, ensuring you select the proper size will give you the best experience, comfort and noise isolation. 12.6MM DIAMETER X 11MM LENGTH: Designed for average size ear canals, these foam tips provide maximum acoustic isolation in comfortable, medium recovery foam eartips. As with all Westone ear pieces, ensuring you select the proper size will give you the best experience, comfort and noise isolation. 5 PAIRS OF REPLACEABLE EARTIPS: With 5 pairs of our replaceable eartips, you'll never have to worry when you lose them before a show or when your friends ask you for a pair. 60 YEARS OF DESIGNING CUSTOM EAR PIECES: Our True-Fit Foam Tips use all the innovations and expertise that Westone has developed in almost 60 years of designing and manufacturing products for the human ear. These replaceable foam eartips enhance the performance in-ear earphones by ensuring superior noise isolation, and a superb fit.