Klutz LEGO Chain Reactions Craft Kit NAPPA Silver Award Winner Design and build 10 amazing moving machines - teach your bricks new tricks Comes with 80 page instructions, 33 LEGO pieces, instructions for 10 modules, 6 plastic balls, string, paper ramps and other components Includes a 80 page instructional book with Klutz certified crystal-clear instructions Includes more than 30 essential Lego elements Recommended for children ages 8+