Small Pyrometric Cones For Accurate Firings In Industrial, Pottery And Hobby Kilns-Cone 04 (Pkg/50)
Some links in this description are affiliate links to Amazon, Blick Arts, and others. You pay NOTHING extra to use these and I make a small commission. You can also purchase something different than I recommend using these store wide links.
Note: Commissions may be earned from the links above.