close up, top down view of a set of four different types concrete reinforcement macro fibers - hooked end steel, white

abstract addition background bars black building bundle bundled cement close closeup colored concrete construction crimped end extreme fibers fibrillated fibrillation flat gray grey hooked industrial industry lay macro material metal plastic polyethylene polymer polymeric polypropylene reinforced reinforcement reinforcing sinusoidal steel stone structural supplement synthetic texture textured top twist twisted view white