DELight 25Pcs C9 LED Christmas Light Bulbs are designed for easy screw-in installation, making holiday decoration a breeze Set the mood for magical Christmas Eve with dimmable C9 bulbs (Dimmer switch not included) Rest assured knowing bulbs are UL certified, ensuring safe and dependable performance throughout holiday season Crafted by shatterproof and waterproof PC shell, built to endure any weather conditions Create a unique and personalized holiday display with colored C9 bulbs (sold separately)