VTR blades are fiberglass with a little bit of carbon used in them. These are the same shape blade as the Falcon.
The Falcon is a carbon fiber blade with a concave shaped end.
The Flap is a carbon fiber blade with (just like it's name suggests) a convex flap shaped end.
I snapped a pic of my Flap 80, Falcon 30, VTR fins to illustrate the differences for you.
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Keep in mind that Flap blades are the same length as Falcon blades, however the 80 series blades which are shown on the right, are about 10-12cm longer than the regular 25, 30, and 40 series blades.
Jim
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