For use with most Coil Tube Audio Kits, either Left or Right Ear. Package Includes: 8 Pairs of Zeadio Earpiece (Coil tube NOT included). Quantity & Size: 2 Pairs of Large, 4 Pairs of Medium, 2 Pairs of Small. As it does not totally block the ear like the earbuds, this enables essential hearing of what is going on around you as well as those essential radio transmissions.