Developed to help you instantly identify important bag pockets, pouches, and keyrings, The Spark ensures you can quickly locate exactly what you need right when you need it. Compact and dependable, it s the smallest and most economical option in the Glow Fob lineup. Available in single or 3-pack options in green or blue tritium, or as a discounted 5-pack featuring green, blue, purple, yellow, and red, The Spark is perfect for personal use or sharing with 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