Need to change up your flashlight's beam? This is the official NITECORE NFB25 High Grade Blue Filter. It's a durable, high-quality lens cover that screws onto compatible Nitecore flashlight heads to turn your bright white light into a focused blue beam. Why blue? Blue light can be super useful for tracking, as it can make certain things like blood trails more visible. It's also great for preserving night vision compared to bright white light, or just for creating a cool, different ambiance. This is an original Nitecore accessory, so you know it's made to precise standards to fit your light perfectly and withstand regular use. Make sure your specific Nitecore flashlight model is compatible before ordering. It's a simple, effective way to expand the functionality of your tactical or outdoor flashlight. A must-have accessory for hunters, campers, security personnel, or flashlight enthusiasts.