Note: Please allow slight error due to manual measurement. Thanks for your understanding. specification: Item Type: Hearing Aid Receiver Tube_x000D_Material: FKM_x000D_Uses: Production and maintenance accessories for hearing aids. Features: 1Hearing Aid Accessories: Important and necessary accessory for hearing aid production and maintenance, wonderful replacement for the old or broken one. 2Good Sound Transmission: Helping to improve the performance of hearing aids, easy to connect and install, no complicated operations required, bring you convenience. 3Simple And Convenient: Change hearing aid tubes by yourself without going to the audiologist for tubing replacements, simple operation, bring you convenience. 4FKM Material: Hearing aid tube is made of high quality FKM material, safe and eco friendly, hygienic and non toxic, stable and wear resistant, durable for use. 5Portable Design: 10pcs of hearing aid sound tube are available, enough to satisfy your use needs, light weight, easy to carry, suitable for home and travel use. PackageList: 10 x Sound Tube