The Blue ZANG coasters by Lava Rubber are the most environmentally conscious rubber coasters on the planet! Lava Rubber is an all-purpose super material made from upcycled closed cell neoprene scraps. Basically, Lava Rubber uses 98% recycled materials to create a brand new and more durable rubber than ever before. Lava Rubber is eco-conscious, upcycled, recyclable, self-extinguishing, easy to clean, resilient, cushioning, and applicable almost everywhere! Also the perfect cushion for your Pipemug!