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The Orton SSB Self-Supporting Cones, Box of 25 are 2-1/2” tall.
Self-Supporting Cones from Orton are used in standard-sized kilns.
Pyrometric cones gauge heatwork, which is the combination of heat and time, inside a kiln.
They work by contracting, or deforming, in the intense heat of the kiln.
The cones correspond to a specific cone number, and when the desired heat and temperature is reached, the cone tip will bend forward to the same level as the base.
For best results, have one cone higher and one lower in the kiln as well.
These cones do not require a holder.