The “garland” consists of a series of load-carrying rollers, attached together by chain links. This arrangement gives to the troughing set the characteristics of mobility and flexibility resulting in a perfect central belt trough. The “garland” is suspended from rigid supports or occasionally spring-loaded which adds further flexibility to the structure. The principal advantage obtained using these types of suspended sets is their possibility to “flex”, in the direction of the conveyor or indeed in a transverse sense. The movement helps to dissipate some of the kinetic energy derived from the friction contained in the conveyed material itself. In this way forces and stresses are absorbed and limited with the consequent reduction in damage to the belt and to the rollers themselves.