I guess I am not sure what you mean by spiral design. This is off their site:
Speed Break shaft is 13.25mm with a white linen melamine ferrule and a very hard phenolic tip
Control Break shaft is 13mm with our laminated maple ferrule and a hard Samsara leather tip
I am thinking that this means for the most part the shafts are the same. The only difference being some front end construction. I have an older OB Break shaft on one of my cues. It is made in a similar fashion to what the regular shafts are made meaning it is laminated, but it does hit a ton with great control.