Fiio f3 dynamic in ear earphones the iem for a colorful life graphene driver diaphragm the f3 utilizes a cutting edge graphene driver diaphragm which is extremely strong and has excellent conductivity due to its properties a graphene driver diaphragm can faithfully reproduce your music giving a clean rich high fidelity sound japanese copper clad aluminium voice coil a lighter voice coil makes for faster transients and better overall sound quality bringing forth even the subtlest of details