Abstract: A leaf spring of composite material has a slipper end assembly comprising two members engaging opposite surfaces of the spring leaf and extending beyond the free end of the spring leaf where they are secured together. Away from the free end of the leaf they are held together by a fastening extending transversely around them and the spring. The spring has a curved portion at its free end, with which the members interfit to prevent their moving relative to the spring. In an assembly of such a leaf with a spring leaf of steel, one of the members held to the spring may engage the steel leaf to hold the leaves in alignment with one another.