Quartet XDR1072 Map Rail, Heavy-Gauge Anodized Aluminum, Natural Cork Insert, 1 x 72 Quartet Map Rail. Heavy-gauge anodized aluminum rail with natural cork insert. Heavy-gauge anodized aluminum rail with natural cork insert. Mounts easily on chalkboards, markerboards or directly on wall. 1" high. Quartet Map Rail. Heavy-gauge anodized aluminum rail with natural cork insert. Heavy-gauge anodized aluminum rail with natural cork insert. Mounts easily on chalkboards, markerboards or directly on wall. 1" high.