From Bohning:

Blazing a new frontier in broadhead flight! With all the steering capabilities of a 4" vane, The Blazer will amaze you with its silence, accuracy & flight characteristics. All this and only 2" of vane! Welcome to the new frontier of broadhead flight! Maximum accuracy, Maximum durability, Minimum noise...and now, Maximum steering with Minimum weight! Each vane weighs only 5 grains!  The bases of all Bohning vanes are chemically treated to promote intense adhesion. No need to clean the bases.