Mini-Condenser Vibration Pickup With Mini-Xlr For Stringed Instruments. Weighing only 18 grams, this ultra-light condenser pickup is ideal for acoustic guitar, mandolin, violin, and most other stringed instruments. The AKG C411 will give a clear and uncoloured sound without changing the balance of the instrument. Attaching the AKG C411 on or near the bridge or anywhere else on the instrument is easy with the included non-marring, reusable, solventfree adhesive compound