Amazingly the space station is comprised of two interlocking pieces making it easy to place on a chain. The 2 piece part is actually printed in high detail plastic, and then using the lost wax method the mold is cast using silver. To be clear, and this is cool ... the chain has no breaks, or seams. The chains are poured in place. If you got this far, think about it. The chains were not made like we have been making chains for quite some time. The option to create interlocking pieces is revolutionary.