Developed from the need to instantly identify your important bag pockets, pouches, and keyrings, The Spark helps you locate exactly what you need when you need it. Compact and reliable, it s the smallest and most economical option in the Glow Fobs lineup perfect for everyday carry. Available in single or multi-pack options, you can choose from green or blue tritium, or opt for a discounted 5-pack featuring green, blue, purple, yellow, and red. Ideal for personal use or as a practical gift for family and friends. Product Details Length (excluding keyring): 0.825" Diameter (excluding keyring): 0.31" Compact and lightweight design Product Features 1 cylindrical tritium lamp per unit Injection molded polycarbonate casing Integrated glass breaker tip Keychain hole / lanyard loop Includes keyring Waterproof construction