The size #4 or #5 refers to "VIRGINIA STYLE" I prefer to use #6. I have caught TOG up to 12 lbs without any problems. Circle hooks - never! Tog rig, easy and simple. Loop on bottom of line for sinker. Up about 3" another loop for hook. Tie hook with 40 LB leader 6" to 8" and put on loop. You can go to any bait store and buy a pack of hooks and see what they look like. I buy them in boxes of 100 and tie up several hundred hooks during the winter. Tog fishing is tops.