Brighten up your holiday season with these 16 replacement blue C9 bulbs from Light Keeper Pro. Designed for use with string Christmas lights, these bulbs are perfect for indoor and outdoor use. They feature a solid pattern and a bulb shape code of C9.

The bulbs are made of glass and metal, and are vintage originals from the 1990s. They have a voltage of 120V and come in a set of 6, with a total of 16 bulbs. These electric-powered bulbs are unisex and suitable for all occasions. Add a touch of nostalgia to your holiday decorations with these Light Keeper Pro bulbs.