Modular belt link module consisting of a main body element and an insert, where the modular belt link module is of the type which when assembled with a plurality of substantially identical modular belt link modules constitutes a conveyor belt, where each main body element has a central part, from which central part eye parts project in a forward and rearward direction with respect to the intended travelling direction, such that eye parts along a front part of one modular belt link may be interleafed between eye parts on a rear part of an adjacent modular belt link module, and where the eye parts each are provided with an aperture arranged laterally to the intended travelling direction, such that when the eye parts are interleafed, the apertures of adjacent eye parts overlap, and a connection pin may be inserted laterally at least through some of the apertures, hingely connecting adjacent modular belt link modules, whereinthe central part and a plurality of the eye parts are provided with a continuous cavity, which cavity extends from either an upper or lower surface and towards the opposite surface, the surfaces defined relative to how the modular belt link module is arranged in the use situation, and where the cavity is at least partly enclosed by the modular belt link module material, and where an insert substantially corresponding in shape to the cavity and at least filling up the cavity is provided.