Used to protect precious artwork, this museum-quality mat board features an innovative design in which three sides are pre-glued to a RagMat backing board, with the fourth side left open to slide the print in place. The inside opening of the mat will be cut 1/2" smaller than the size ordered, a 1/4" overlay on either side of your artwork. The mat board, made with Crescent 8-ply RagMat, is available with and without a V-groove.