Fiber reinforced core material The fiber-reinforced build-It FR material is the ideal material for use with FiberKleer 4x and FiberKor Fiber Posts. It is formulated so that it flows and stacks without a slope, and the unique viscosity of the material enables it to be used both as a basic building material and as a subsequent material for cement. Specially treated fiberglass provides a compressive strength of at least 300 MPA, to obtain a strong and reliable basis for indirect restorations.Designed for versatility and optimal performance, build-It FR base material self-cures in minutes or light treatments in seconds for a strong consistency. Choose from shades A2, A3, Opacious White, Gold and Blue either in 25 ml automatic blending cartridges or 4 ml Mini Mix TM syringes.