Silhouette tree spikes make the perfect decorative compliment to any tree, fence post or wood pole. These beautifully crafted life like silhouettesd will transform your backyard garden area into a work of art. Each bird is made of steel and as each piece is exposed to the elements, it will form a natural protective patina. Raven Steel products are made from strong American steel, designed by veterans, and handcrafted with care. Proudly manufactured in the USA by American veterans.