This is our most common size and allows for the best of both worlds for rope capacity vs size of winch.
The Cobra2 Standard drum will hold,
39m (130′) of 9mm (5/16″) rope
36m (120′) of 10mm (3/8″) rope
30m (100′) of 11mm (7/16″) rope
25m (85′) of (12 1/2″) mm rope