For Your Own Sound World - Cresyn earphones offer dynamic sound quality by overcoming the confined sound quality of conventional kernel earphones. - The introduction of soft silicon caps eliminates the stress on the ears caused by prolonged use. - The sound blocking effect eliminates background noise on bus and subway rides, allowing the user to comfortably enjoy the music without turning up the volume. - Ear caps come in three different sizes Ear caps of three different sizes are provided in the basic package to provide the user with an optimal fit and an effective noise blocking effect.