Specs:

The Thunderbird PRO IV features mahogany body wings and a rock-solid, 7-piece (Walnut/maple) neck with through-body construction for amazing sustain and tone. The Thunderbird’s SlimTaper™ profile neck has a 34” scale length, 12” radius, and 20 medium jumbo nickel/silver alloy frets. The nut width on the 4-string model is 1.50” 

Electronics:

The Thunderbird PRO features Epiphone's new T-Pro bass humbucker pickups which include custom active electronics and EQ. The pickups are powered by a 9-volt battery which is easily accessible in the back of the body. No previous Thunderbird model has ever sounded like this!