【Durable Construction】4 pack slim pen lights are made of anodized machined aviation aluminum, which makes them not wear out over time and can withstand drops and bumps. Perfect for biking, hiking, camping, and other outdoor activities. 【Super Bright】Each small flashlight is equipped with 1 super bright LED and can last up to two hours with only two alkaline battery (battery included), please remove the red insulating sheet before use. Lights up your paths and small dark spaces for a long time.