SednaEarfit Crystal keyword with compression ZERO design. This is an important factor that ultimately determines the sound quality of the earphone. The SednaEarfit series is a high grade replacement earpiece that features a basic design and axis structure based on the data analyzed by 788 people of the ear canal, allowing for a higher level of fitting and holding power to the earphone nozzle, while improving sound isolation, and the unique shape ensures direct sound direction, and improving high range characteristics with natural tones. The latest model "SednaEarfit Crystal" has been developed with the keyword of "Compression ZERO design" to achieve the highest quality that will not fatigue even if worn for the longest period of time in the series. With stage space sound and beautiful shining style, these earpieces solve the problem of modern days such as long time wearing and dropping the earbuds, while maximizing the potential of the earphone. Earphones are not included