Feel the electricity run through your body with the electric inferno roller coaster building set from k39nex using the 645 k39nex parts and pieces including rods connectors and track create this electric inferno that sends the coaster car hurtling through the twists and turns then download exclusive instructions to build a second modelr r r motorised chain lift coaster systemr r downloadable alternate build instructionsr r over 640 k39nex partsr r requires 2x aa batter