K'NEX Double Doom coaster Special Offers Includes a red tethered battery

Includes a red tethered battery motor and 2 spring motors

Technical notes

but as this was not supplied by the manufacturers

Follow the colour-coded instructions to build the towering model one piece at a time

K'NEX Double Doom coaster Special Offers Includes a red tethered batteryTwo coaster cars equal double the trouble with the Double Doom Roller Coaster Building Set! Build with classic K 'NEX rods, connectors, and track that build a model over 0. 78m (3 feet) high. With the motorized action, your 2 coaster cars will go on a twisting and turning ride. For even more fun, download instructions for a second model, the Wild Warp coaster. Models can be built one at a time. Requires 2 "AA" batteries (not included). Download