Specification:Material:Aluminum+plastic. Feature:Made of metal and plastic chip, long-lasting. Suitable for acoustic guitar. With three sensors, one 6.35mm Jack. Description:Item type: Pickup. End-Pin jack length:0.6cm. Sensor Size(approx): 2.7cm. Cable Length(Approx.) : 60cm. Package Include:1 x Pickup. The colors deviation might differ due to different monitor settings.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.Suitable for acoustic musical instrument. 3. Plastic film from the back of the transducer to protect the adhesive. Note:The measurement allowed error is +/- 1-3cm.