Strap

The strap (1) has a metal band strip provided with a fastening unit and exhibiting wall thicknesses that differ at longitudinal gradients. The metal band strip comprises a middle region (2) whose wall thickness is less than wall thickness at end regions (3). The metal band strip comprises a section made of steel and another section made of aluminum alloy. The middle region is linearly extended, and an end piece (5) of the end regions is perforated and comprises a flange plate that is connected with the end regions.