SubliSLATE™ Largest Rectangle, 7.8" x 11.7". Smooth, machined 3/8" sublimatable slate, each with unique fractured edges. These plaques make exciting photo presentations. (2) Black plastic "feet" are included. 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.