These coasters are silk screen printed on natural cork by hand.They have a very colourful custom look and show four different classic Porsche 911 designs from several decades.Look for other designs as well.The traditional silk screen printing method is a dying art but produces the most beautiful results as with these coasters.Each Coaster is different and gives out a unique design.Eco Friendly Cork Product.Cork is a highly renewable and eco-friendly resource.New thicker design.