SummaryGreat addition to your 40 watt Chinese laser cutter. I was able to cut my laser power by 25% and increase my cutting speed 40% with this simple part. Here is my parts list 1 X Air Assist for 40 Watt Chinese Laser engraver 1 X metal insert 10mm Dia from a Harbor freight kit. ( http://www.harborfreight.com/20-piece-air-compressor-starter-kit-68191.html) You can build this part yourself if you want to 1 X Air brush pump from Harbor freight ( http://www.harborfreight.com/1-5-hp-58-psi-compressor-and-airbrush-kit-95630.html) 1 X ~8mm drill bit to open metal insert