A belt (1) for dosing reinforcing fibres (3) during the manufacture of fibre concrete material or fibre composite material comprises at least one longitudinal supporting element (2) and the reinforcing fibres (3). The fibres (3) are applied transversely or under angle different from 0° with respect to the supporting element (2). The fibres (3) are connected to the at least one longitudinal supporting element (2). The advantage of this way of dosing fibres in concrete is that the filling of sacks or bags is avoided and that the amount of foreign material getting in the concrete material is limited.