QUALITY MATERIAL: The 9907090039 heating element replacement for Masterbuilt 40" smokers is made of quality stainless steel, featuring in good thermal conductivity, oxidation resistance, and well-tested by the manufacturer to meet the OEM standard. COMPATIBILITY: The electric smoker heating element can replace Masterbuilt part number: 9907090039, compatible with Masterbuilt 40" digital electric smoker models including: 20070211, 20070311, 20070710, 20070810, 20071311, 20071411, MB20072916, MB20074719, etc. .