SureFire E1B Silver Backup LED Flashlight E1B-SL-WH Coated Borofloat window maximizes light transmission High-efficiency LED: no filament to burn out or break, lasts thousands of hours Sleek clothing-friendly low-snag body Total Internal Reflection (TIR) lens creates flawless beam with extended reach Rugged aerospace-grade aluminum body, Mil-Spec Type III hard anodized in black