Characteristic order display

How do I control the order that characteristic options appear. It seems to be displayed in alphabetic order but I need to specify a different order. For example, we are selling a name badge with two different backs, pin and magnetic. Magnetic is $1.00 extra. I need the pin type back (no extra charge) to be the default but the magnetic type always comes up.

When you add your characteristic to your product, you can define the default value:
www.hikashop.com/media/doc/product_form_characteristics.png

Got it. I kept looking at that field and thought it was just a preview of the dropdown. I didn't see the 'Default value' above it.
Thanks.