single layer [thin](单层【薄款】) single-layer deepening [thick]](单层加深【厚款】) single layer [deepening and thickening]](单层【加深加厚款】) double-layer binaural [thin](双层双耳【薄款】) double-layer binaural deepening [thick]](双层双耳加深【厚款】) double-layer binaural deepening [thickened]](双层双耳加深【加厚款】) double-layer four-ear [thin](双层四耳【薄款】) double-layer four-ear deepening [thick]](双层四耳加深【厚款】) double-layer four-ear deepening [thickened]](双层四耳加深【加厚款】) three-layer deepening [thick]](三层加深【厚款】) single-layer deepening [combination cover]](单层加深【组合盖】) double-layer deepening [combination cover]](双层加深【组合盖】) three-layer deepening [combination cover]](三层加深【组合盖】) single-layer bakelite [combination cover]](单层电木耳【组合盖】) double-layer bakelite [combination cover]](双层电木耳【组合盖】) three-layer bakelite [combination cover]](三层电木耳【组合盖】)

28cm(28cm)