7HZ Timeless II IEM features the latest R&D from our team, with a bigger 14.5mm diaphragm, which is the world's first use of dual-sided coated diaphragm in the IEM.DUNU S&S Eartip is availble in 4 options according to the eartip size: S/M/L, S, M, L, which can meet most people's needs.