Product Description: Advantages: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Special super-thin and strong peel-and-stick tape are attached on the transducers4. Both the tranducers and the endpin-jack are mounted inside the Mandolin. 5.Includes stereo TRSS endpin jack ,this Mandolin twin internal is a twin-head transducer. 6.The Mandolin Twin Internal transducer delivers better sound for you because of the internal mounted pickups. Corlor:BlackJack: 1/4 inch (6.35mm) Stereo TRSS endpin jackMaterial: Copper and pizo electronImpedance: High ohmic Cable Length: Approx. 40cm/ 15.75inchWeight: 1500g Package includes: 50 x Mandolin Dual Sensor Pickup