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LASER TREE 40W 20W Laser Module Head 450nm TTL PWM for Laser Engraver Blue Light | eBay
Amazon.com : NEJE A40640Ⅱ Laser Module, 10W+ Output Power, FAC Tech - 2 x Beam, Built in High Pressure Air Assist, Come with Metal Nozzle, Compatible with Laser Engraver and Cutter :