Abstract: A flexible power transmission means comprising an assembly of a chain constructed of a plurality of sets of interleaved links joined to its next adjacent set by a pin, and load blocks surrounding the chain and located between the next adjacent pins. Additional load blocks may be located over the pins. The load blocks are generally contoured at their edges to fit into the V of a pulley. When the load blocks are close together, the front and rear surface of at least some of the load blocks are tapered to permit articulation of the assembly. The load is carried by the chain's pins; the blocks are located longitudinally by the pins.