The product is a large 5.5" x 4" unknown specimen rock or fossil, maybe lava with a unique and intriguing shape. It is perfect for aquarium enthusiasts or collectors of rocks and fossils. This piece would make a great addition to any collection or could be used as a decorative element in a home or office setting. With its natural beauty and mystery, this rock specimen is sure to be a talking point and a focal point in any display.