The K’NEX Thrill Rides Typhoon Frenzy Roller-Coaster Building Set promotes creativity and makes a wonderful gift for your budding engineer. It comes with 649 pieces that include rods, connectors and tracks. It even comes with a motorized chain lift to send the silver coaster car twisting and turning through over 19′ of swirling tracks. Score the K’nex set for $22 from Walmart (Reg $49.97). Shipping is free on orders $50 or more or choose Ship to Store for FREE shipping.