Joker Machine Sportster Fork Tube Caps 10-310B Replace those basic looking, plain chrome caps on your Sportster with OEM 39mm tubes with a set of Joker fork tube caps Gives your Sportster fork tops a GP Road Race billet aluminum look, opposed to the stock chrome-plated steel caps Fully CNC-machined from 6061-T6 billet aluminum Much lighter than the existing stock steel units O-rings are included