Tonearms of exotic materials- esp. Carbon?

Regarding exotic materials for tone arms....

I am aware of Alphason and SME using titanium on some arm tubes, and, believe it or not, Technics using Boron and Titanium nitride on some arm tubes.

Sony used carbon "charging" on some arm tubes.

Grado and Grace using hardwood.

Graham using ceramic.

SME using Magnesium for some.

Even have seen what looks like polycarbonate on an unidentified arm. ???

As to CARBON FIBRE/CARBON TUBING- my main point of interest-

ADC offered three arms, Pioneer offered at least one arm, Infinity's Black Widow at least one.

Any more CARBON FIBRE/CARBON TUBING arms you know of?:scratch