Bernese Mountain Dog Coaster On Natural Welsh Slate. The diameter of the coaster is 85mm and approximately 3mm thick with green fabric backing. Delivery of this item usually within seven days. Full product money back guarantee if not completely satisfied. If you just require this item on its own please telephone your order through and we can offer you a more competitive postage rate than shown on our web site. Search: Bernese Mountain Dogs. Click On Image To Enlarge.