Suitable for many acoustic instruments. The piezo transducers give you the flexibility to acheive the sound you want. The adhesive heads can be positioned to your requirements, internally or externally which lets you place them in places that are comfortable for you, and helps create a balanced sound. The TGAT are supplied with a jack can be fitted permanentely internally or attched externally by the mounting sleeve supplied. Head Diameter: 25mm ? Cable Length 385mm.