Constructor GraviTrax: Extension Hammer

GraviTrax - the power of gravity! Extension Hammer pack includes: 1x Set of Instructions/ 1x Hammer Base/ 1x Long Rail/ 2x Medium Rails/ 3x Short Rails.

GraviTrax allows you to design and build your own marble runs and experiment with gravity / magnetism and kinetics to propel your marble to the finish. With a variety of tiles levels,tracks and elements you can control the speed of the marble.