Welding head For Ultrasonic Plastic Welder Plastic Spot Welding Machine Note: not include the machine and handle Material: Aluminum alloy model：# 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 Head optional, pls choose one of them for your need. (pls leave a meesage / note to us via ebay for which one you need) What in Package: 1 X Welding head