They are made of 90 mm round Galvanized steel pipe which are then powder coated with Dulux undercoat then a Orange top coat. They are a stylish looking bollard with a ball as a handle to prevent any leverage points. All internal components are made from stainless steel to prevent corrosion for outdoor application. The sleeve which is core drilled or concreted into the ground is also made of Galvanized steel and stainless components to prevent rusting. The retractable bollards are easy to retract with the internal locking mechanism. When retracted, the bollards are flush with the finished concrete.