DX Engineering Radial Wire Biodegradable Anchor Pins are designed to keep your cables down in the ground. They are manufactured from recycled PLA (polylactide resin). Depending on the weather conditions, they will degrade in about a year. The biodegradable anchors are easily installed and will hold radial wires in place until lawn roots overtake them, and then disappear. They're ecologically friendly! They don't slowly rust away like metal staples. DX Engineering Radial Wire Biodegradable Anchor Pins are intended for turf or softer ground where they may be pushed in or lightly tapped with a tool head--not driven in with a hammer. Since they are a plastic-like material, they will be subject to breakage in rocky or hard soil.