1.WPC 30%HDPE 2.60%bamboo/wood fiber 3.10% chemical additives,easy to instal 4.100%recycle,strong steel structure Yongsheng WPC landscape material components:30% HDPE (Grade A Recycled HDPE),60% bamboo/wood fiber (Professionally treated dry bamboo/wood fiber),10% chemical additives (Anti-UV agent, Anti-oxidation agent, stabilizer, colorants, anti fungus agent, coupling agent, reinforcing agent, ...