GMB101 4 string Electric Acoustic Bass Guitar have a Basswood Top, Back and Sides, ABS nut, Rosewood Bridge and Fingerboard. The body length 44.5 in has a better resonance, making the sound fuller.The GMB101 body shape features a crisp midrange, bright treble and balanced tone with a straight fingerboard for fingerpicking and sweeping. Also Glarry GMB101 have an adjustable truss rods, effectively keeps the neck of the bass guitar straight and allows you to adjust the distance between the strings and the fingerboard to get the most comfortable playing experience.The EQ-7545R bass preamp to produces high-quality sound with Built-in Volume control and the 4-bands equalizer adjustment of bass, middle, treble, and presence. You can play bass guitar with or without an amp.