Fit Sony WFXM5 WFXM4 compatible with sony WF WI XBA MDR inear seriesThis memory foam with Latest polyurethane foam the ear tips is specially designed for Sony WFXM5 earbud more softer and comfortable than other ordinary foam materials.The WFXM5 foam tips very soft antislip provide 24 hours comfort suitable for long wearing and exercise.After many tests and designs the memory foam tips noise isolation offers superior audio experience enhanced bass and good seal block out external noise.11 designed for sony WFXM5 the filter cotton is installed inside as soft and comfortable as the original fit in charging case works with wfxm5wfxm4wfxm3 WFC buds S and more inear buds.