Any way to share data between Polymer components?

Currently I have two Polymer components that share a great amount of data. You can see here:

<polymer-component1
      series="{{series}}" 
      stackhelper={{stackhelper}} 
      stack={{stack}}
      controls={{controls}} 
      camera={{camera}} 
      threed={{threed}} 
      scene={{scene}} 
      renderer={{renderer}}>
</polymer-component1>
<polymer-component2 
      stackhelper=[[stackhelper]]
      stack={{stack}} 
      controls={{controls}} 
      camera={{camera}} 
      threed={{threed}} 
      scene={{scene}} 
      renderer={{renderer}}
      guiobjects={{guiobjects}}>
</polymer-component2>

This is working fine right now but whats the best practice about sharing data? Any way to share all the properties between two components?