These flags have a 2.5″ ball and shorter vane so you have the ability to gap your flags at the shorter distances. Great for the 25 to 100 yard distances.
The design of rectangular vane shape has several advantages over other shapes. This allows more of these flags to be stacked or overlapped in the scope, and still be able to see the ball because it is now at the top of the flag.
Another advantage is the rectangular shape of the Flat Top vane is visually less confusing when trying to read the angles than a vane shape that already has angles cut into it.