Rubber Bands! To hold things together... loosely... or tightly depending I suppose on how much you stretch them. These babies are 7"... wait... 7" long? I guess that makes them 14" in diameter? But they are... they are rubber bands... so... that's the measurements when it's not being stretched.... hold on let me measure...
 
...yes. They are roughly 7" long when not stretched... so... yea... Better get them while I have them! Once they are gone, I won't have any more and it's not like they grow on trees! Or... wait. Actually they come from a tree technically... but they aren't on the tree... they are in the tree so I guess it still checks out.