The #5 B-10 Blade is a hybrid of a indiana and colorado blade with the added feature of a fold down the center to enhance the flash.  It has a nice cup that helps the spin in fast or slower current and in a fast or slower troll application.  It also works well on a herring or anchovy rig.  It measures 1 3/4 long x 1 inch wide.   

The #3 and 4 B-10 blade is now available in a limited number of patterns.  These blades makes a great spinner and are ideal for using with bait rigs.