AeroRigidTM 291B is a sandwich panel made with aluminum facing and 5.7 lbs/ft3 aluminum honeycomb that is designed for aircraft interior structural and nonstructural applications such as monuments, shelving, partitions, bulkheads and galleys. 291B is an AeroRigid 2024 Aluminum Honeycomb Epoxy with .187″ Cell and 5.7 Density