Our tools depicted here are all you need to make any of the circles shown on this site:

1. Stalk-stomper, two piece 6 ft model.
2. Stalk-stomper, one piece 4ft model.
3. Ball of pre-stretched nylon string.
4. 2 ft long marking pole.
5. 100ft plastic surveying tape.
 
Not shown here:
6. OS Pathfinder map (field boundaries and pathways).
 
Optional equipment includes:
7. Infrared image intensifier
8. Dowsing rods/pendulum