Premium X-CEL Combination Boards A versatile communication tool that puts class in the classroom. Ghent's premium combination boards are shipped fully assembled and are configured to meet the highest level of product specifications. Aluminum framed X-CEL units blend the function of a chalkboard or markerboard with a tackboard, and feature a full-length chalkrail, joiner strips and a 1" maprail above the top of the writing surface.