Silk Birch Tree Branches. Silk Birch Trees. Artificial silk birch tree branches are not made from real silk. Artificial silks are made from synthetic fabrics, plastic coated iron wire and are not made of any real silk. Silk tree branches come un-shaped. We try our best to accurately display the colors of the silk tree branches shown on our website. However, depending on your monitor, we cannot guarantee that your monitor's display of any color will be accurate.