Widths are 1/16" or so more or less than 5.5" wide & the lengths are a little off too. We just wanted to make the boards as big as possible, so we didn't focus on specific dimensions! The following is very close to accurate!
 
1-4/4 X 5" X 17"
 
4 pieces 4/4 X 5.5"9ish) 
21"
2-20"
16"
 
Pictures show lots of knots & character - these pieces will be fun to work with!