Get ready for slithering fun with the Cobra's Coil Roller Coaster Building Set from K'NEX! Build with over 200 K'NEX parts & pieces including rods, connectors, track and silver coaster car to create this slingshot powered serpent that sends the coaster car hurtling through over 9 feet of heart-pounding thrills! Then, download exclusive instructions to build an incredible second model, the Rattlesnake Rush! Ages 7 .