Groundbreaking new material with unprecedented thinness and flexibility. Graphene, with a thickness of only 0.335nm, is a new nanomaterial that is extremely strong and has excellent conductivity. Due to its properties, a graphene driver diaphragm can very faithfully reproduce your music - giving a clean, rich, yet transparent high-fidelity sound. A lighter voice coil makes for faster transients and better overall sound quality. This exactly describes the Japanese copper-clad aluminum voice coil utilized in the F3, which allows it to present a transformative listening experience by clearly bringing forth even the subtlest of details within the music. The F3 includes 3 different sizes of ear tips. Not only does this allow the user to choose a size based on what is comfortable for them, but also allows them to choose the sound they want since different ear tips have different sound signatures. The ear tips are both comfortable to wear and environmentally-friendly to boot. FiiO subjects its products to quality standards stricter than what is normally found industry-wide; all to give you the highest-grade goods. These are some of the durability tests that the F3 goes through - vibration testing, temperature tests, anti-oxidation testing, wire durability testing, cell phone compatibility testing and sound quality experience check. 1 year warranty support. 3.5mm TRSS plug with 1.2m cable. In-ear monitor headphones with 11mm dynamic drivers and 40 ohms impendence. 15Hz to 23kHz frequency response. 5mW maximum input power.