The handle materials so far have been:
- CF/G-10 Laminate
- Titanium (two different finishes)
- Raffir Noble (acrylic with brass and copper wire mesh)
- FRN
I know Sal was talking about a machined stainless steel one.
Perhaps some of these:
- Aluminum
- Bone
- Brass
- Carbon Fiber (solid CF)
- Copper
- G-10
- Micarta
- Stainless Steel
- Wood