This coaster set is a bio-composite of 70% bamboo fibers and other natural materials. Bamboo is a fast-growing plant that thrives without fertilizer or pesticides, making it the perfect resource to harvest again and again. Perfect for entertaining during indoor or outdoor activities and events. Set of four (4) coasters. BPA free. PVC free. Phthalate free. Do not microwave. Dishwasher safe (top rack only), hand wash recommended. One-piece natural gift box included. This product contains bamboo fiber, which is a natural material. Color and pattern variances are to be expected.