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Orton’s patented Self-Supporting Cones are the most accurate and easy to use witness cones available. Since the correct height and angle are built into the cone, reproducible firings can be achieved time after time.
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. Complete with built-in base, these unique cones require no cone holder or plaque for support on the shelf during firing and can be set on any flat surface. Self Supporting Cones are recommended by glaze and kiln manufacturers to achieve the best results.
Self-Supporting Cones are available for use from 1087F to 3106F (586C to 1708C). Cones are numbered from 022 to 32. Cone 022 is the cone that will deform at the lowest temperature (1087F) and cone 32 is the cone that deforms at the highest temperature 3106F (1708C).
1 Box contains 25 2 inch cones
Orton Resources: https://www.ortonceramic.com/pyrometric-cones