Originally Posted by Andrew R Stewart

"higher grade" usually means a greater tensile strength and thus a harder to work with (cut/file/bend) material. The primary reason to use it is to be able to reduce the tubing wall thickness and shed a few ounces. Even the most basic grade of specific bike tubing is more than strong enough to make a wonderfully riding bike from. Dedacciai started by ex Columbus employees and tend to mimic that brand's products and materials.

But I find it interesting that you seem to not trust the builder. Almost like you are expecting to be taken advantage of. I hope I am wrong and that your relationship with the builder is a positive one. Andy