RADIUS ATOMIC BASS ALMNM BLKEARBUDS BULK PKG NOT F EARBUDS BLKFrequency response: 20Hz20kHz Neodymium magnets and 10mm drivers produce superb bass responseUltra-light aluminum design with interchangeable ear plugs for optimized comfortSensitivity: 103dBImpedance: 32 ohmsGold-plated 3.5mm plugIncludes 3 pairs of ear plugs (S,M,L)