TuneSound tube filters are replaceable filters for HYPƐAR Sonic Superior earplugs that let you adjust how much ambient sound and bass you hear. Choose smaller diameters for fuller bass and stronger isolation or larger diameters when you need more awareness, for example when running in traffic. Smallest tube diameter [mm] in tube filter. The smaller tube diameter, the fuller bass. With increased tube diameter you hear more ambient sound. The safer choice if you e.g. are going out to exercise in city traffic. You also avoid taking out the earplugs if you need to have a short conversation. Filter choice: 0.15 mm; 0.20 mm; 0.25 mm; 0.35 mm; 0.4 mm; 0.5 mm