The TriView 4 is described by the manufacturer as the industry s marker for creating awareness of buried facilities and reminding excavators to call before they dig. The triangular profile combined with the internal Flex PLUS rod makes the TriView the most durable marker post available; it rebounds after impacts. Product pages note: 360-degree visibility, withstands -40 to +150 F, 10-year warranty, vinyl marker post decals sold separately. Test station options and grounded locate plate accessories are available (see manufacturer fact sheet).