Depends on what styles of pen you want to make . For me , I would lop off 1.25 inch on each end , giving me 4 Sierra type straight grain blanks , then make four 0.75 inch slabs , each of which should give two full length X-ct and two Sierra length X-ct . But if you want to make a Panache , your full size blanks should be closer to 6x1x1 .
If the wood is not completely dry , ignore all of the above .