1. Item Name: Hearing aid PVC tubing2. Application: In-ear Monitors / BTE hearing aid earmolds3. Material: PVC4. Color: Transparent5. Diameter: 2*3 mmFor earmoulds used with BTE (behind the ear) hearing aids and in-ear monitors, the quality of tubing is very important.For high powered aids the tubing should be thick-walled with a hole diameter of 2 mm. Use of standard tubing on high powered aids may cause feedback.Earmoulds need to be re-tubed regularly. Replace the earmould tubing as soon as it begins to harden.It is surprising how much the tubing can affect the sound quality.