Since they do not specify what grade or grain you are going to get I can only guess it is not contest grade wood. I.E "R/C grade"! Suggest you go directly to Texas for some real balsa, (Do not pass GO). You can tell them exactly what you want and you'll likely get it. You can buy STIFF, LIGHT balsa for profiles. BTW, I like 4" X 42" for my profiles. No patching, and room to design something cool! Don't be too upset if you get a slightly warped piece, Just build the rudder offset into the warp!