ALUMINUM ALLOY MATERIAL: Overdrive Guitar Pedal is made of aluminum alloy material, it is sturdy and durable. 4 KNOBS: 4 knobs including vol, gain, treble, bass. GUITAR EFFECT PEDAL: It can either be used as a overdrive or can be used in more of an EQ role being always on and used to shape your voice. EASY TO CONTROL: The 4 knobs allows versatility in your sound. you can cut or boost with surprising precision. TRUE BYPASS DESIGN: True bypass switch lets your instrument's signal pass through a non electronic bypass line when the effect is disengaged, feeding your amp with direct, unaltered signal from your instrument. Specification: Material: Aluminum Alloy Size Chart: 11.2x6.4x3.4cm/4.41x2.52x1.34inch Package Includes: 1x Overdrive Guitar Pedal Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!