Liquid-cooling radiators come in all kinds of sizes these days. No, seriously. Thermaltake now has a whopping 11 different models in its Pacific family, each with a different thickness, length, and fan configuration.
The slimmest of the bunch belong to the Pacific R series. These units measure about 1.6" thick and are available in 120-, 240-, and 360-mm sizes. The Pacific RL radiators are much fatter, at 2.5" for the versions with 120-mm fans and 2.2" for the ones with 140-mm spinners. Both RL series run the gamut from one to four fans, with the largest measuring 560 mm!
All the radiators use zinc-infused aluminum to reduce corrosion. They come with G1/4" hose connectors, and the fins are brazed rather than soldered. Thermaltake claims brazing results in more uniform heat transfer than soldering.
The Pacific radiators are meant for DIY types, so they don't come with fans, plumbing, or other components. Thermaltake does offer a full kit with the Pacific RL 240-mm, though.