6'4" X 20 1/2 X 2 11/16
Great board in great condition! You’ve probably seen Allan Gibbons boards (especially the twin) on your feed and there’s a reason for it. These things are sick and fast!
I don’t know the exact volume but PADDLES REALLY WELL for how loose and maneuverable it is on wave. 
If you want a quiver killer twin this is it! Handles waist to over head.
Enjoy!
FINS INCLUDED
$120 fins too and they’re included…