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Flexible double helix
Spring Racer with Mass Holder and Spring Powered Trike)
15 of which may be found in the full-colour instruction book
As used in 78890 K'NEX Amusement Park Experience set
K'NEX Crossfire Chaos coaster K'NEX Brick parts Flexible double helixGet ready for a gravity defying adventure with the Crossfire Chaos Roller Coaster Building Set! Build with K'NEX pieces like rods, connectors and track. Use the rubberband powered sling shot launcher to send the silver coaster car twisting and turning through over 5m (18 feet) of swirling, non stop action! Or download exclusive instructions to build an incredible second model, the Torpedo Twist coaster. Download Instructions Order replacement parts