1High quality copper chrome plating, stable current, clear tone, low loss. 25mm Input jack, 6.35mm output jack. 3Audio input jack can be directly connected with bridge piezo transducing pickup bar, while output jack connects the audio. 4Refit acoustic guitar and for repair, replace and DIY for luthiers and instrument lovers. 5Installation is more convenient, does not need to install equalizer & preamp. Features: High quality copper chrome plating, stable current, clear tone, low loss. 2.5mm (1/10") Input jack, 6.35mm (1/4") output jack. Audio input jack can be directly connected with "bridge piezo transducing pickup bar", while output jack connects the audio. Refit acoustic guitar and for repair, replace and DIY for luthiers and instrument lovers. Installation is more convenient, does not need to install equalizer & preamp. Specification: Color: Silver Material: Copper Input jack: 2.5mm (1/10") audio jack Output jack: 6.35mm (1/4") audio jack Dimensions: Approx. 6cm x 1.5cm x 1.5cm / 2.4 x 0.6 x 0.6in Weight: Approx. 17g Package List: 1 x 2.5mm Female to 6.35mm Female Endpin Jack