The Outdoor Plus OPT-LUNFW38-GRY-LP 38" Gray LP Luna Fire & Water Bowl, Match Lit. At The Outdoor Plus, we specialize in creating high-quality, durable, luxury, and beautifully designed fire and water features using GFRC concrete. GFRC concrete is a type of concrete that is reinforced with glass fiber. These fibers result in a strong and durable material that is perfect for creating fire and water features. In addition to being strong and durable, it is also lightweight and resistant to weathering and erosion.