Accordibg to the specs on the CRK website (below) it is "silicon bronze." Some googlefu will show it seems to be an ideal choice for the application...
SPECIFICATIONS:
Blade Material: CPM S35VN Stainless Steel
Blade Hardness: 58-59 RC
Blade Length: 3.25" (82.55 mm)
Blade Thickness: 0.125" (3.175 mm)
Lock Spring: 6Al4V Titanium
Lock/Thumb Lugs: Silicon Bronze
Handle Length: 3.94" (100.08 mm)
Handle Material: 6Al4V Titanium
Handle Thickness: 0.125" (3.175 mm)
Weight: 3 oz. (85.05 g)
Pocket Clip: 6Al4V Titanium
Thanks for the post kidcongo! Great pics & write up...made me appreciate the one i have even more!!
Got it pre-owned from a fellow forum member, and the opening / closing can easily be done with one hand..nicely broken in guess...