Marathon Pace Bands......One of the keys to a good Marathon time is to run at an even and steady pace for the distance. If you have a target in mind, then you'll need to know what your mile splits are.
Click on this LINK and you can create a pace band for your time. Ideally, you should cut out the strip and laminate it. Put it around you wrist and use a piece of tape to keep it in place. If you can't laminate it then cover it in clear sellotape. Otherwise the paper will just absorb the sweat from your wrist and break.