Silk Oak Tree Branches. Silk tree sprays are great for replacing your older branches with new silk tree sprays to give it a new look or if you just want to make your own silk tree. Artificial silk tree sprays are not made from real silk. Silk sprays are made from synthetic fabrics, plastic coated iron wire and are not made of any real silk. Silk Tree Sprays come un-shaped. We try our best to accurately display the colors of the products shown on our website. However, depending on your monitor, we cannot guarantee that your monitor's display of any color will be accurate.