@hawaiibadboy should be answering these questions. It’s his IEM.
Graphene is a form of carbon in a two-dimensional, one atom thick film. It is the basic structural element among other allotropes, including charcoal, graphite, and carbon nanotubes. Graphene is 200 times stronger than the high-strength (high-carbon) steel and it efficiently conducts heat and the electricity. Carbon materials usually have excellent acoustical properties. The graphene drivers are very thin and light and come with a small spring constant, so that the air itself damps the motion. The damped air in graphene converts almost all the energy into sound and is therefore potentially very efficient. Graphene diaphragm is very strong and thin and requires no or little external damping.
Graphene material is known for its highly conductive strong, and thin, and lightweight properties. Graphene is an ideal material for speaker diaphragms as it is amazingly strong and can be extremely thin and light weight. It is also relatively expensive. Graphene is stronger than steel and thinner than a paper and is best at electricity with the electrodes moving at a speed of 1/300 of lightspeed. The lightweight property allows it to move rapidly and act sensitively. The strong property of graphene keeps it unbreakable and unchangeable. A thin graphene of 100nm can bear a load of up to 2 tons. It can also hold its shape in motions and vibrations.