Bierfilzl Square Felt Coasters - Turquoise $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. Color: Turquoise. 4" x 4", 4 pack. Made in USA.