ThinkFun Maker Studio - Propellers Building Kit Make a chopper, a biplane, a windmill and a plane or use your imagination to build something all your own This set features propellers and comes with essential engineering parts including a spool, an X-linkage, connectors, wheels, rods, and hub caps 10 Engineering challenges encourage exploration and problem solving Supports skills in Science, Technology, Engineering and Math (STEM) and stimulates imagination and creativity Ages 7 to adult For people of all ages who want to challenge their mind and sharpen their skills, ThinkFun is the worlds leader in addictively fun games that build reasoning and creative thinking skills through play.