This is a new flywheel fan that fits the Jonsered 66e and 70e. This is only the plastic fan, not the metal flywheel. This part is 3D printed out of PETG and has shown excellent durability on the saws it has been placed on. Please note, you may need to take a bit of sand paper to the ID in order for it to properly fit onto the flywheel. I haven't heard any complaints about this, but please be aware given the tolerances of the flywheel itself, you may need to do some fine tuning.