Hollow-Core Fiber Beams a Kilowatt of Laser Power Up to a Kilometer - IEEE Spectrum
Hollow Roller® Laser Guide | Carter Products
Amazon.com: KPOSIYA Pack of 70 Laser Cut Favor Boxes, 2.8”x2.5”x3.2” Wedding Party Small Gift Boxes Hollow Out Candy Box for Wedding Birthday Party Baby Shower Bridal Shower Favors (pack of 70, Beige):