... : aluminum alloy 3. on time delivery 4. tolerance +-0.01mm Audio earplug accessory for cnc / accessory for cnc/ cnc Product Typeaudio ... by express, 3~5 days door to door service.Application Audio, MP3, MP4, earphone, hearing aids, surgical instrument etc..RemarksAll parts ... are looking forward to have long term cooperation with you!! audio earplug accessory for cnc