Designed in a C9/5mm shape, and emits a warm white glow. These bulbs are made for use in string-light sets, particularly those that use C9-style sockets (or compatible 5 mm sockets). Because they are LEDs, they consume much less power than traditional incandescent Christmas bulbs and run cool to the touch. The casing is durable, shatter-resistant — making them safe for both indoor and outdoor use.