It measures approximately 12″ x 12 x 12.25″ . Imported from Creative Ceramics in Europe, these are simply the finest slumping molds we have ever found on the commercial market. Slipcast from a specially formulated clay body, they have an exceptionally smooth surface, accept kiln wash uniformly, and do not crack under repeated usage if handled properly. Note: The measurements given here are for the outer dimensions of the molds. This is to help you determine whether a given mold will fit in your kiln. Since they are handmade, individual molds will vary in size. Never cut glass to fit until you have measured your mold.