A bellows for a vacuum interrupter, exhaust compensator or valve, the bellows comprising: - a main body comprising a first material; wherein the first material is stainless steel; wherein, the main body comprises a first end portion and comprises a second end portion; wherein, the first end portion is configured to be connected to a first part of a vacuum interrupter, exhaust compensator or valve; wherein, the second end portion is configured to be connected to a second part of the vacuum interrupter, the exhaust compensator or the valve; wherein, the main body comprises a flexible section; wherein, the flexible section is configured such that the first end portion can move relative to the second end portion; wherein at least a portion of an inner surface of the flexible section comprises a second material different to the first material; and/or wherein at least a portion of an outer surface of the flexible section comprises the second material; wherein the bellows is for a vacuum interrupter and wherein the second material comprises a galvanic coating of: chromium or nickel; or wherein the bellows is for an exhaust compensator or valve and wherein the second material comprises a galvanic coating of: chromium, nickel zinc or tin; characterized in that at least a portion of the inner surface of the flexible section comprises a third material different to the first material and different to the second material; and/or wherein at least a portion of the outer surface of the flexible section comprises the third material. - a main body comprising a first material; wherein the first material is stainless steel; wherein, the main body comprises a first end portion and comprises a second end portion; wherein, the first end portion is configured to be connected to a first part of a vacuum interrupter, exhaust compensator or valve; wherein, the second end portion is configured to be connected to a second part of the vacuum interrupter, the exhaust compensator or the valve; wherein, the main body comprises a flexible section; wherein, the flexible section is configured such that the first end portion can move relative to the second end portion; wherein at least a portion of an inner surface of the flexible section comprises a second material different to the first material; and/or wherein at least a portion of an outer surface of the flexible section comprises the second material; wherein the bellows is for a vacuum interrupter and wherein the second material comprises a galvanic coating of: chromium or nickel; or wherein the bellows is for an exhaust compensator or valve and wherein the first material is stainless steel; wherein, the main body comprises a first end portion and comprises a second end portion; wherein, the first end portion is configured to be connected to a first part of a vacuum interrupter, exhaust compensator or valve; wherein, the second end portion is configured to be connected to a second part of the vacuum interrupter, the exhaust compensator or the valve; wherein, the main body comprises a flexible section; wherein, the flexible section is configured such that the first end portion can move relative to the second end portion; wherein at least a portion of an inner surface of the flexible section comprises a second material different to the first material; and/or wherein at least a portion of an outer surface of the flexible section comprises the second material; wherein the bellows is for a vacuum interrupter and wherein the second material comprises a galvanic coating of: chromium or nickel; or wherein the bellows is for an exhaust compensator or valve and