These are 29" x 9" only in the roughest sense.  I'd say the the narrow dimension varies fully from 9" to 9.5".  And the edges aren't necessarily square either.  But aren't they cut using some kind of infallible carpet slicing robot?  Or is this the work of a guy with a straight edge and an Exacto knife?  Also, they're about as thin and flimsy as a product like this could be.  True to color though.