Coasters That Work Wool is the most hydrophilic of all natural fibers, absorbing as much as 30% of its weight without feeling wet. Our traditional Bierfilzl ("Beer Felt") are the highest quality German merino wool felt coasters on the market today. Their clean and minimal execution offers an unexpected textural and refined modern heritage element to any home decor. Set includes 4 hand-cut heavy duty 5mm thick wool felt coasters to provide extra surface protection. --- * 5mm merino wool felt * Includes 4 coasters in heather white, granite, charcoal, and black * Available in classic round or square * Made in USA * Overall: 4" x 4"