Toysmith's mission is to supply quality toys and gifts while delivering superior customer service with the core belief that children learn through play. With Toy smith's Wind Turbine Kit, you can harness the power of wind and convert it into electricity by building your own turbine. Watch the Wind Turbine capture the wind's energy and turn it into light. This kit will teach you how this vital renewable-energy technology works in a fun, recreational way. Details: When completely assembled, the blade has a span of 13.3" Requires an empty two-liter soda bottle and a small Phillips head screwdriver (not included)For ages 5 and up