These charts can be a handy aid in selecting balsa from available stock for different portions of the structure of a model. To get a larger chart in the Adobe Portable Document File (PDF) format that will fit lengthwise on a letter size sheet, click here for the 3" sheet chart, and click here for the 4" sheet chart. If you don't already have the Adobe Reader software, go to http://www.adobe.com to download it for free.