Irregular Round Blate Pottery Form BundleThis bundle contains all three sizes (17cm, 22cm and 28. 5cm diameter) in our Irregular Round Blate Form collection, plus one Base Handle. The forms are 3. 2cm thick with a roundover rim profile. These irregular pottery forms are compatible with the Pottery Foam press method. Fin Pottery Tools pottery forms are designed and made in Australia from high quality MDF. They are machine made and hand finished, and available in a variety of shapes and sizes.