Dye DYE x FREEFLOW Colab DFF20 Beavertail is the latest in DYE's lineup of premium autococker parts. Pays homage to the original and iconic designs from both Dye and Freeflow beavertails of the past. The DFF beaver tail boasts a 3-D machined tail and mount and the functionality of the iconic wire design that Freeflow is known for. 6061 3D machined Lightweight Fits virtually most Autococker 45 frames.