Hi there

I use all sorts of things to shape my pieces...I use kids shampoo bottles and deoderant sticks...My suggestion is to use a cloth tape measure and find something oval that is 7in around 7 1/2 inches and one that is 8 inches...thise are the 3 most popular sizes for braclets

faith manages

kelsey

You can buy a ready made metal cuff bracelet of a size and shape you like and  use that as a form for your wire work.  There is such a thing as a bracelet mandrel too, like the ones you use for shaping and sizing rings only wrist size. Jeanie

I like this, it works like a charm. 
I also use a cloth tape measure for the sizes, 7.5 and 8. 

Bracelet Bending Plier

Oh, those look like so much fun! Thanks for the link!

For me it depends on what gauge wire I'm using.  If it's thick enough to need to be hammered & hold its shape, then I use an oval bracelet mandrel.  Took me long enough to buy one.  If it's softer & has a built-in clasp, then I might just form it around one of the shapes suggested or try the cool nylon jaw pliers.  Good luck.

sher

try the end of a wooden ax handle.  Perfect shape (oval)... and you can hammer it.

Ditto, Pisces.  The oval mandrel works like a charm and I just manually shape anything softer.  I might have to try those bracelet pliers out, though!