First of all, only 1 follower board should be used. Standard 1" lumber is fine. Use 1x4, 1x6, 1x8 or 1x10 depending on super size. Cut each board 18 and1/2" long and place a finishing nail in each end at about 1/2 inch down from the top. These boards replace a frame at one side of the brood nest. These boards are easy to remove so that your 9 frames can be worked easily. Go through the frames from one side then place the follower board on the other side when finished. Follower boards are not critical as to dimension as long as bees are worked frequently. It they are left in for many weeks without working your bees you may find brace comb built onto the side of your board. You can cut ears into a longer board to make it fit if you wish to be a little more fancy. Follower boards are simply a matter of preference. I have used them for many years and like them. At this time, I am not using them. They are inexpensive and easy to make. I recommend that you try them on 1 hive and see if you like the idea. Good Luck, Ray Nabors University of Missouri Apiculture Specialist