Material: zinc alloy Features:1. High quality and testing is fine.2. Item 100% like the picture shown3. Allows Full size headphones to be connected into the Smaller 3.5mm jack socket4. 3.5mm mono Jack to female 6.5mm Jack Socket.Most pc，PDA，laptop provide 3.5mm audio jack，with this 3.5mm to 6.5mm jack， you can plug microphone 6.5mm jack to pc，laptop，PDA.Also can plug guitar to pc for recording.Package include:1* 3.5 to 6.5 Headphone Audio Adapter jack