What is Macrotwist 54MM? It is a long-lasting, Synthetic Macro Fiber Reinforcement that can be used as primary reinforcement in concrete, has high strength, is polymer based, provides crack resistance and load bearing with two different materials in its composition. Twister is homogeneously dispersed in 54 mm concrete, providing the desired concrete appearance and strength during and after pouring, with minimum labor and cost, and offers ease of application to projects.