Our liquid-filled LED glow pens provide interactive promotion of your marketing message. Quality constructed of solid brass and acrylic components, each pen features a matte silver finish with clear fluid-filled chamber that features a custom 3-D plastic "floater." The interior chamber is filled with a standard colored oil of your choice and is illuminated with the press of button on the barrel. Red LED can be set to "steady on" or flashing" mode. Twist-action ballpoint pen features black ink cartridge. Each operates on 3 button cell batteries (LR41) included. Individually polybagged.