The Nevos Sponge is a cancellous allograft that is demineralized, a process which preserves inherent growth factors and results in sponge-like handling characteristics. Made entirely from cancellous bone, the Nevos Sponge provides a 3D porous structure with elastic properties, providing maximum surface contact with surrounding structures. When hydrated, the Nevos Sponge can be easily compressed to fit inside intervertebral cages or irregularly shaped defects.