Corcell 80g Density 4mm Thick Corematerial. Comes in a sheet size 24"x48" and a package of 4 sheets. Corcell offers a closed cell foam that provides a higher strength laminate than a typical composite with Divinycell. This specific sheet of material has small grooves slit into the face of the sheet to provide a better resin flow for infusion. Using a corematerial will increase rigidity of parts because you are separating out the layers of high strength material. To provide an analogy, take a look at a typical bridge, there is a beam on the bottom and one on top. These are separated by sections of steel placed at an angle. This corematerial is essentially those angled pieces of steel thus making the top and bottom beams harder to flex.
Due to the difficulty shipping this product. It is only offered in a 4 pcs minimum.