Krypto-Lite Atoms are a "little" piece of work (pun intended). These can be made in any metal type. At a mere 1/2 inch in length and 7/32 of an inch in diameter at the base, this is a little cousin to the perforated model. Using the quarter for scale, the following pictures will help you understand why this one is called an Atom. They have a center shaft that can accommodate the included vial filled with v10 glow powder or a 1.5x5.5mm tritium vial (not included). They come complete with a miniaturized card and miniaturized bag.