SubliSlate™ Round Coaster, 4" Diameter. Sublimation GLOSS. Smooth, machined sublimatable slate, each with unique fractured edges. Slate can vary in size by up to -0.4". Production for slate requires the use of a green rubber pad, 1/8" thick and at least an inch larger than the plaque. Sold separately. Perfect, innovative addition to any home decor. Our slate is a natural, hand cut material and imperfections in shape, size, and coating are to be expected.