I can make you pretty much any size and section of silver bangle that you could want and I've only listed the more popular ones here. If you can't see what you want then please contact me.
The bangles in the image are 4, 5, 6 and 8mm oval section oval shaped bangles
Here you can choose from width, section (the shape you'd see if you cut through the bangle) and the actual shape of the bangle itself. I tend to supply mostly oval as they sit on the wrist rather better but you can choose round if you prefer.
I'd suggest that you don't opt for a 4mm bangle in the rectangular or reversed D section as it would be rather flimsy. Other than that, help yourself to whatever you like!