Fly's current hubguard compatible with the Classic Front Hub. Made with heat-treated 4130 chromoly it is very durable & will guarantee against spoke breakage due to grinding when installed. It replaces the cone on the hub, so once everythings tightened down it will remain rock solid till the day it dies. Heat-treated 4130 Chromoly steel. Knurled edge for best clamping grip. Only Fly Classic compatible. Weight 40g / 1.4oz.