http://www.steel-fiber.com/steel-fiber/round-crimped-steel-f

Corrugated steel fiber - new type, better performanceUndulated steel fiberRound crimped steel fiber is a new type of reinforced fiber. It is fabricated by cold-drawn low carbon steel wire which conforming to EN 4889-1 Type 1 and ASTM A820/A820M-04 Type 1. Corrugated profile adds pull-out resistance compared with rebar, which is increasingly replaced by steel fibers.Advantages:Excellent shrinkage control; When encountered by initial cracking, slower loss of bearing capacity than the ohter fiber types. Huge pull-out resistance beacuse of its special structure. Ideal for jointless industrial floors and for structural applications. Packaging:Packaged in carboard boxes or as required Net weight/box: 25kg Item Diameter (mm) Fiber Length (mm) Wave Depth (mm) Wave Length (mm) Aspect radio (l/d) Tensile Strength (MPa) Number of fibers per kg Total fiber length per 10kg (m) RC39/35BN 0.9 35 0.4 - 0.65 8.0 39 ≥1200 5500 1925 RC50/50BN 1.0 50 0.4 - 0.65 8.0 50 ≥1150 3100 1550 RC60/60BN 1.0 60 0.4 - 0.65 8.0 60 ≥1500 2500 1550 RC39/50BN 1.3 50 0.4 - 0.65 8.0 39 ≥900 1850 910