The watt-saving Titanium Bolt Hardware Upgrade Kit is compatible with both of their seatpost clamps – the bolt-closure version and the quick-release version.
These lightweight beauties come in three different finishes: Black, Gold, and Oil Slick. The kits include a bolt, threaded barrel, and Ti-Prep grease (they do not include the actual aluminum seat post collar or QR lever), and weights are claimed at 4.3g for the bolt closure, or 4.9g for the QR. WTC claims that this is 50% less than their steel counterparts, so roughly a 4-5g savings.
Ti hardware upgrade kits will sell for $12.95, and can be added on to any seatpost clamp order from WTC. Order the kit or a new seat post clamp at the link below.