Reinforcing elements for castable composition

A unitized package having a plurality of dispersible packages, said dispersible packages comprising a plurality of polymeric fibers subject to entanglement when introduced loosely into a castable cementitous composition, substantially all of said fibers having a diameter ranging from about 0.127 mm to about 0.81 mm, maintained in a substantially aligned relationship in which essentially all of the fibers are available for mixing into the castable composition in the form of individual fibers substantially upon disruption of said dispersible packages,

• said dispersible packages each having a height ranging from about 0.25 cm to about 20 cm, and a diameter ranging from about 1.0 cm to about 10 cm,
• said dispersible packages being maintained in said unitized package in a close-packed, side-by-side alignment by a primary dispersible containment means, said primary containment means comprising a perimeter wrap.