The K5 is a five string solid body electric bass model introduced by Ibanez in 2002. It is the first signature model for American bassist Reginald "Fieldy" Arvizu who is best known for his work with the nu metal band Korn. It was made in South Korea.
The K5 features padauk top and back on an SR series double-cutaway mahogany body bolted to a wenge and walnut neck with a 24-fret rosewood fingerboard with a K5 logo at the twelfth fret. Components include a pair of Ibanez ADX-5 active bass pickups with a Vari-Mid III preamp with a three-band EQ, a fixed bridge with 16.5mm string spacing and a plastic nut.