“Spiral dots” with dots arranged in a spiral shape on the inner wall of the earpiece suppress the turbidity of the sound and realize a clear sound. A new hybrid configuration that combines SMP iFit, a material with mechanical properties close to the skin, and high-quality silicone has been adopted to achieve a clearer sound with higher purity and an excellent fit that feels good on the skin. A high-grade model of replacement earpieces that allows you to enjoy customized sound quality and fit.