What materials do simulation tree manufacturers usually use to make simulation trees?

What materials do simulation tree manufacturers usually use to make simulation trees? follow Simulation trees can generally be divided into three types, One is the real wood rod simulation tree. The main rod is made of real wood rod. The original ecological version of the simulation tree has a high degree of simulation. The second is the FRP simulation tree. The main pole adopts international steel structure, and the outside is wound with environmental friendly epoxy resin, plus plastic leaves. The third is the cement simulation tree, which is made of concrete.