The Outdoor Plus OPT-3636SQSSEKIT-NG 36" Stainless Steel Natural Gas IID Forma Fire Pit. Forma is a modern, clean, and cubic fire pit that is perfect for your outdoor space. Our Fire Pits are individually handmade and proudly manufactured in the U.S.A. The fire pits we manufacture are durable and long-lasting in a variety of environments. Because of its handmade nature slight variations in color and texture may occur.