1Aluminum alloy body, surface electroplating treatment, high gloss, excellent workmanship. 2Simulate the real pen grip and touches feel, very comfortable to hold. 3Builtin high performance strong motor, stable needle discharge, reliable in use. 4Thread designs at handle to increase skid resistance of hand when operation. 5The diameter of the handle is 25mm. Very light and easy to work for a long time without feeling tired.