The GO! Storm at Sea die is a Block on Board? (BOB?) die that is specially designed to include all the shapes on one die board to create a 3-color, 9" finished repeating block with single sashing. The Storm at Sea die includes the highly requested 60-deg Diamond in a Rectangle for the sashing, specialized dog-ears and 1/4" seam allowances for easy alignment and piecing. Imagine how long it would take to cut all of these pieces by hand! The GO! Storm at Sea makes it so easy. Can be used on GO!, GO! Big and GO! Studio.