Wireless Earbuds,True Wireless Bluetooth Headphones Earphones HD Sound Mini in-Ear Earbuds Sweatproof Bluetooth Earpiece Built-in Mic Long Battery with Charging Case for Sport (Black) Key of F/Bb double .468" bore 12-1/4" large-throated, hand-hammered, red brass bell .310 venturi of nickel silver Tapered, hand-lapped brass rotors