4 pack includes colors green, red, blue and yellow. Emits steady glow for 12 hours continuously. Great for camping, back packing, fishing, hunting or hiking. Light sticks also make great patio lights and night lights for tents and RVS. Great to keep in the car or house for emergencies. Use as flairs and emergency lights for home or car repairs. Ideal for scuba diving. Very easy to use: remove from foil wrap, bend once, snap and shake and you're done. Red Green Blue Yellow Cyalum 6 inch lightsticks 4 pack. Length: 6" (inches).