Five Finger Death Punch are rocking out all summer long on the Mayhem Festival, and bassist Chris Kael is enjoying the opportunity to put his stamp on his new CK-4 signature model Spector bass guitar.

The instrument features neck-thru body construction with carbon fiber reinforced three-piece rock maple. The rosewood fingerboard comes designed with 24 frets. Alongside the solid maple body wings is the EMG BT Tone Circuit and EMG P/J active pickups.

Kael says, "Having played Spector long before joining Five Finger Death Punch, I am extremely happy to now be in a position to collaborate with them on the design of the new Chris Kael CK-4 Signature Model. Combining the playability and feel of Spector with the tone of the EMG P/J pickups and the attitude of the brass knuckle bridge, this is the bass I've always wanted. One man, one beard, one bass. Spector, son."

The CK-4 model will be available in matte black or matte white with black hardware, with a "Knuckle-Head" brass knuckle plate in black designed for the white model and in chrome for the black model. For a closer look and additional specs on the CK-4 signature model Spector bass, check here.

Five Finger Death Punch are touring in support of 'The Wrong Side of Heaven and the Righteous of Hell, Vol. 1.' The first volume is due July 30 and can be pre-ordered here. The second volume is expected this fall.