A sagging resistant strip having a thickness of less than 0.15 mm produced by a) casting a melt comprising, percent by weight: <0.30% Si, preferably <0.25%, most preferably below 0.20%, ≤ 0.5% Fe, below 0.1% Cu 1.0-2.0% Mn, ≤ 0.3% Mg,, 0.5-4.0% Zn, ≤ 0.5% Ni, 0.05-0.2% of dispersoid forming elements from group IVb, Vb, or Vlb, and unavoidable impurity elements, each at most 0.05%, in a total amount of at most 0.15%, the rest aluminium, wherein, if the melt in a) is casted so as to obtain a core ingot, b) preheating the core ingot at a temperature of less than 550°C, preferably 400-520°C, more preferably 400-500 °C, most preferably more than 430 °C up to 500 °C, so as to form dispersoid particles, and wherein a braze alloy based on Al-Si (Si 7-13%) is provided on the core ingot either before or after said preheating, c) hot rolling the core ingot with the braze alloy to obtain a clad strip, or hot rolling the core ingot to obtain a core strip and providing a strip of a braze alloy, d) cold rolling the clad strip obtained in step c), or the core strip obtained in step c) together with the strip of a braze alloy to obtain a clad strip, with a total reduction of more than 95 % of the core without intermediate annealing giving recrystallisation of the material, resulting in a strip having a first proof stress value, e) followed by a heat treatment to the delivery temper with the purpose to soften the material by a tempering without any recrystallisation of the strip alloy, in such a way that a strip is obtained having a second proof stress value which is 10-50% lower than the first proof stress value obtained directly after cold rolling in step d, preferably 15-40% lower, and lying in the 0.2% proof stress range of 100-200 MPa, more preferably 120-180 MPa, most preferably 140-180 MPa, wherein sagging resistance is ≤25 mm on a strip less than 0.1 mm in thickness and the 0.2% proof stress value after brazing is at least 60 MPa, and the strip in delivery temper comprising particles having an equivalent diameter in the range of 50-400 nm with a number density in the range between 1*10 6 and 20*10 6 particles/mm 2. a) casting a melt comprising, percent by weight: <0.30% Si, preferably <0.25%, most preferably below 0.20%, ≤ 0.5% Fe, below 0.1% Cu 1.0-2.0% Mn, ≤ 0.3% Mg,, 0.5-4.0% Zn, ≤ 0.5% Ni, 0.05-0.2% of dispersoid forming elements from group IVb, Vb, or Vlb, and unavoidable impurity elements, each at most 0.05%, in a total amount of at most 0.15%, the rest aluminium, wherein, if the melt in a) is casted so as to obtain a core ingot, <0.30% Si, preferably <0.25%, most preferably below 0.20%, ≤ 0.5% Fe, below 0.1% Cu 1.0-2.0% Mn, ≤ 0.3% Mg,, 0.5-4.0% Zn, ≤ 0.5% Ni, 0.05-0.2% of dispersoid forming elements from group IVb, Vb, or Vlb, and b) preheating the core ingot at a temperature of less than 550°C, preferably 400-520°C, more preferably 400-500 °C, most preferably more than 430 °C up to 500 °C, so as to form dispersoid particles, and wherein a braze alloy based on Al-Si (Si 7-13%) is provided on the core ingot either before or after said preheating, c) hot rolling the core ingot with the braze alloy to obtain a clad strip, or hot rolling the core ingot to obtain a core strip and providing a strip of a braze alloy, d) cold rolling the clad strip obtained in step c), or the core strip obtained in step c) together with the strip of a braze alloy to obtain a clad strip, with a total reduction of more than 95 % of the core without intermediate annealing giving recrystallisation of the material, resulting in a strip having a first proof stress value, e) followed by a heat treatment to the delivery temper with the purpose to soften the material by a tempering without any recrystallisation of the strip alloy, in such a way that a strip is obtained having a second proof stress value which is 10-50% lower than the first proof stress value obtained directly after cold rolling in step d, preferably 15-40% lower, and lying in the 0.2% proof stress range of 100-200 MPa, more preferably 120-180 MPa, most preferably 140-180 MPa,