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This is a Micro Swiss replacement thermal tube for MK10 / MK11 hotends. The lower thermal break is made from stainless steel, and the colder upper part is made from aluminum. Stainless steel was used for thermal break because it offers low thermal conductivity, and aluminum was used for the upper portion because it has a lot better thermal conductivity, to carry away any heat from the filament.
Threads size: M7