This is a 3D printed two finger attchement piece for the T.R.U. Ball Fulkrum Flex and Abyss Flex release models. This is a RCRchery, Inc. custom designed piece that allows us to convert the releases into a two finger model with a completed finger curve on the outer finger. Price includes shipping to the lower 48 states. All color versions are special order items and will take roughly 4 weeks to ship.