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1. Soft, specialized connective tissue 2. Between the cementum covering the root of the tooth and bone forming the socket wall. 3. Width - 0.15 mm to 0.38 mm. 4. Hourglass shape apicocoronally, corresponding to the rotation point of the tooth. 5. Thinnest in the middle, at the axis of rotation 6. Widens coronally and apically. 7. Thickness maintained by the functional movements of the tooth.