Cone: 10 Firing Color: Oxidation: White - Reduction: Gray/White Consistency: Slightly Firm Avg. Shrinkage ±2%: 14.75% Avg. Water Absorption ±1%: 0.3%---COE x 10-6: 5.46 Made primarily of English Grolleg. Contains plasticizers to make this the finest translucent porcelain available for throwing, thin slab work and handbuilding. The "standard" porcelain for the US Northeastern potters. Very similar to Coleman and I would task you to prove it isn't...in a blind test.