The Lightning MX1 is a high speed, fat rim, low profile distance driver that goes 10% farther than any other driver in the line. Slightly overstable at 170g.
Weight range - 165 -176 grams. Some of the 170-177 float, so do not, therefore you need to specify which one you want.
The Lightning MX-1-Floater has a different "core" - that part that makes the pancake-stack shape on the underside.
It has a slightly wider rim, and a much thicker 'Flight-Plate" resulting in the ability to float ...(lightning cut it inward, and lower).
Soon will have different stamps than non-floaters.
Like the #2 Driver only faster and 15% better for distance.