Pickup for double bass. It's an evergreen. Adjustable single magnets. Comes with volume control. Fingerboard installation. Soft, warm tone with no background noise. The pickup is fitted to the instrument with two small screws on each side. You can adjust the spacing to fit your instrument using the two sliding brackets. Measurements l x w x h (mm): 95x42x52, Weight g/item: 230, Surface: Nickel