What is this?This is a replacement air tube for an acoustic air tube earpiece.What will I get?Color: ClearMaterial: SiliconeTotal Length: 500mm/16.7 inchIn the package of: 4pcs x Clear Acoustic Tube, 8pcs Mushroom Ear Tips IncludedAre there any advantages of the product?Clear Acoustic Tube with Quick Disconnect, Easy to be Replaced, Comfortable, and Durable.How to use it?Clear-Colored Replacement Coiled Audio Ear Tube for Two-Way Radios, Acoustic Tube with Easy installation.What should I notice?There may be a slight color difference between the real object and the picture. For manual measurement, please allow a slight dimensional error of the item.