Ahren’s Cycles Offers Titanium WiseCracker Bottle Opener Headset Spacer, Only Works with Light Beer
They’re machined from a solid sheet of Ti, bead blasted, then etched with their logo. They retail for $25 each and, as Mike Ahrens says, they’re lighter than some alloy spacers that don’t have any special skills.
Check their blog post here for pics of the manufacturing process. Prost!