With four sizes to choose from, these post tension cable warning markers prevent building owners and tenants from damaging post tension slabs and structural integrity. The bronze concrete markers—stamped with “Warning Post Tension Slab - Do Not Cut Or Core”—easily install into fresh or pre-existing concrete and last longer than marking paint. Position the markers on one or both sides of the slab where the tendons and anchors are placed. Berntsen International Inc. 800-356-7388. www.berntsen.com