SureFire aluminum-body Illumination tools are Machined from a high-strength aerospace aluminum alloy Polymers are durable, lighter in weight than aluminum, and are more comfortable to hold in cold weather Aluminum oxide is the second-hardest substance known to man, exceeded only by Diamonds SureFire multi-axis computer numerically controlled (CNC) lathes ensure precision-machined components SureFire uses integrating sphere photometers to measure the total lumen output of our Illumination tools النوع معدات خارجية