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Self-Supporting Cones are the most accurate and easiest to use witness cones available. They provide the same information as Orton Large Cones. The advantage of Self-Supporting cones is that they are the correct height (1 3/4" exposed above the base) and have the 8 degree bending angle built in. They do not require plaques. Self-Supporting cones can be set on any flat surface. Please note that pyrometric cones usually arrive with pairs stuck together, you need to snap them apart before you use them. This is done to keep breakage low while in transit.