Cylindrical, rigid polymer post for precise casting of a one-piece cast post/core. Provides an X-Shape retention pattern for superior mechanical grip and cement venting. Easy replication of the entire length of the post space. Stabilizes the wax core build-up during removal. Enables individual choice of alloy. The plastic material burns away cleanly. Color code purple, size 5.5, diameter 1,40 mm / .055“.