If anyone wasn't aware, tennis balls cut in half make for great "cones" to use as practice in parking lots. If you ever feel like setting up more advanced drills for yourself, they work great. They are... Cheap Light weight Bright (easy to see) Stable on the ground Easy to make Fit in saddlebags Safe to run over on accident Won't break easily Just be sure to buy DDFM's Drill book and cones first... THEN, supplement with chopped tennis balls.