This is a brand new and sealed Takara Tomy MB-03 Ultra Ball.  It is 7 cm in diameter (or about 2.75 inches).  

This is the original Flat-hinged version.  Please see comparison pictures, in addition to the hinge design the original has more shiny/metallic coloring.  (I am also selling the newer redesign version)

- Shipping -
You will be charged $5 base shipping.

- Combined Shipping - 
I'm selling multi designs of Pokeballs and offer shipping discounts upon multiple purchases.  (You may need to message me if eBay does not automatically reduce shipping)