Heavy Gauge Stainless Boiling Pan. 20" x 20" x 5.25" deep. Wide for great evaporation. Won't warp and buckle like thin hotel pans when used on a fierce heat open flame. Have 2 if you want to use 1 as a preheater and 1 as a the evaporator. I use the evaporating pan also as the finish pan and catch the sap at just the right temp/density and don't finish in an upright pot.