With the extension piece creates dynamic high speed all fischertechnik ball are creative due to additional high speed flex runners, 180 degree curves and parts even rasanter and Kurvenreicher build and complementing. The high speed flex rails with raised side edge allows maximum speed of the ball in the corner. The 180 curve provides a change of direction of the globe even in tight spaces. With the dynamic high speed set can play an unlimited creativity in the fischertechnik ball tracks to more action and speed. Includes 3 x 180 degree curve, 7x High Speed Flex Strip, various parts (angled bar CZ stones etc). This cutlery is a perfect complement to all boxes the dynamic range.