The RV Oven Heat Diffuser is ¼” x 12” x 12” made from A-36 steel and weights 10 lbs. The heat diffuser fits most RV ovens, it’s durable and distributes heat evenly. When people are camping in their RVs or travel trailers they might use pizza stones or ceramic tiles to diffuse the heat, but the arVen Oven Heat Diffuser works better and will not break in transit, it is a one-time purchase. Baking with this oven heat diffuser in place is a game changer. Proudly made in the USA by a woman-owned company. Patent Pending.