30%HDPE,60%wood fiber,10% chemical additives feels like natural wood durable, color stability easy to install,100%recycle YongSheng WPC wood plastic composite: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, ...