Amazon.com: DGHUNST 3PCS Laser Si Mirrors Dia. 20mm 0.98inch for CO2 Laser Engraver Cutter 10W-200W, Si Mirror Silicon Material Reflector Lens for CO2 Laser Cutting Engraving Machine
Laser Line High Reflectors – Lambda Research Optics
Reflective Mirror Engraver | Co2 Laser Reflector Mirror Si | Reflector Lens Laser Co2 - Lenses - Aliexpress