1. This kit includes a circuit and a set of pickup for jazz bass 2. Easy to install and use, gives you professional performance 3. The circuit has a bass, treble, volume and balance controllers, can offer you easy adjustments 4. The pickup can perfectly collect bass sound with high quality signal 5. Nice replacement for your old broken one Spec: Features: This kit includes a circuit and a set of pickup for jazz bass. Easy to install and use, gives you professional performance. The circuit has a bass, treble, volume and balance controllers, can offer you easy adjustments. The pickup can perfectly collect bass sound with high quality signal. Nice replacement for your old broken one. Specification: Material: Metal Color: Shown as picture Volume: A500K Bass: ±12dB at 85Hz, B50K Treble: ±12dB at 7KHz, B50K Balance: MN250K Weight: Approx. 250g Package List: 1 x Circuit 1 x Pickup