Okay, here is the deal, KustomCaps makes custom laser-etched headset caps in a variety of sweet anodized colors. That’s it. KustomCaps are the perfect finishing touch for your ride and fit 1 1/8" steerer tubes. This is the most common size on modern bicycles. We currently do not have caps to fit the older 1" steerer tubes and newer 1 1/2" tubes found on some downhill specific mountain bikes. We'll hopefully have stuff for you crazy people soon.