250th Anniversary round train pulpboard coasters set of 8. A Steam train Americana image celebrating the 250th anniversary on a 3.5 inch coaster.  Pulpboard coasters are absorbent, disposable coasters typically made from recycled paper pulp. They are known for their ability to absorb condensation from beverages, protecting tabletops from water damage. Pulpboard is also a sustainable option, as it is biodegradable and can be recycled. 250-COSP