This variant of the Rough and Smooth Boards with Box carries the same Sensorial function as the standard set — supporting tactile discrimination and indirect preparation for the sandpaper letter sequence in the Primary environment — and may differ in board count, strip gradation, or box dimensions suited to a specific classroom configuration. Before ordering, verify the strip gradation sequence matches the progression already on your Sensorial shelf to ensure continuity for children moving through the materials. It is a reliable replacement or supplementary set for classrooms running parallel groups or replacing worn materials.