· Deluxe Zinc-alloy Single chestpiece, special designed chestpiece for better sound correct.
· Light copper or Stainless steel binaural alternative.
· With inner spring binaural tube assembly.
· Special binaural design to suiting ear structure.
· With uniquely designed binaural thick tube assembly.Excellent thin-wall design, Products have good flexiblity,
sealing ability and adaptablity.
· With Standard single PVC tubing, various color is available.






