Keva Contraptions Reactions- MindwareGet the fun rolling with this unique set that includes traditional KEVA planks, special coloured planks and a variety of unique pieces to set off chain reactions. Using the precision cut planks, dowels and special pieces that securely stack together, builders can create tunnels, ramps and other contraptions that cause chain reactions like ringing a bell, knocking over a bowling pin and more. The possible combinations are endless in this educational