Sturdy Board foam board is ideal for signs, presentations, displays, craft projects, and school projects. It is strong and rigid yet lightweight and easily cut with an X-ACTO knife. It is the better alternative to poster board and stands up so your work stands out. Sturdy Board features a rigid foam center with smooth, clay-coated paper surface sheets on the top and bottom. Sturdy Board is ideal for building models, prototypes, and mock-ups.