Safe and Clean Material from Korea (KCC's 'Medical Silicon') Tapered Eartip structure gets thinner towards the inner ear, therefore reduces pressure and makes it more comfortable with best seal. Silicon filter and Micro Mesh protects from dust, debris, ear wax getting into the speaker. Fits perfectly in the charging case, no need to take off the eartips when charging. Very small size added (SSS) - Various option of size by analyzing the shape of more than 1,500 ears over two years. (L-Large / ML-Medium Large / M-Medium / MS-Medium Small / S-Small / SS-Small Small / SSS-Small Small Small)