Fly Boy Balsa Rubberband Airplane Model GUI4401Details: This is the FOURTH SKILL LEVEL in the "Build N Fly" construction kit series, a series whichwill teach you how to build and enjoy flying model airplanes. The Fly Boy requires you to use all the simple building methods experienced in thefirst threekits. This challenging airplane will reward you with the longest and highest flight performance ever! Wing Span: 21" Building Time: Approximatly 8 hours For Ages13 and up