We searched the globe for the best slate coasters to use in our very own production. Now you can get the same high quality craftsmanship for your sublimation needs. Each coaster measures approximately 3.5″ Square with a white smooth, machined top, each with unique fractured edges. Excellent bundle item with matching slate plaques. 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.