12" Casting sq. Steel Gauge: 18 Armored Kiln Gearâ„¢: Quality Stainless Steel Molds Slumpy's is proud to provide durable, long lasting, high quality stainless steel molds we call the Armored Kiln Gearâ„¢ (AKG) line. The AKG line produced from aerospace grade (304 or higher) stainless steel offers high resistance to heat and corrosion, durability and heavy construction guaranteed to last! We are so confident that you will be satisfied with the craftsmanship of our AKG molds, we will guarantee the performance for at least one year from purchase. So look for the Armored Kiln Gearâ„¢ shield and to be assured that you can drape and slump on our AKG molds with confidence.