Bierfilzl Square Felt Coasters - Ocean $24.00 Default Title - $24.00 Quantity This product is currently sold out. The traditional Bierfilzl. These coasters are made of 5mm German Merino wool felt. Naturally water resistant, stain resistant, heat protective and insulating. Colors: heather blue, turquoise, cobalt blue and marine. 4" x 4", 4 pack. Made in USA.