The Slash Silicon Marker 21 is an essential tool for easily sorting fish. Made from heat-resistant, cold-resistant, and non-slip silicone, this marker is built for repeated use and long-lasting durability.It simplifies sorting your catch by threading the marker through the fish's tail, gills, or mouth. Its straightforward design ensures easy insertion—just guide the tip of the lower part through the hole in the head section for secure placement.