Weather vanes are made of 14 gauge steel and come with a one year warranty on the finish and a lifetime warranty on all workmanship. A 3 step finishing process is used – First the units are zinc plated for better adhesion and durability. Then an antique copper vein powder coat is baked on and followed by a clear powder coat to protect against the UV rays. This provides a durable, scratch resistant finish. Sealed ball bearings are used in the wind cups to keep them spinning freely with even the slightest breeze. The design tops are laser cut in one piece, minimizing welding and making them a unique addition to your home. The tops are interchangeable and easy to change.