FIVE main COLORS for choiceThe eco-frinendly Sentai WPC is made of: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, stabilizers, colorants, coupling agent, reinforcing agent, lubricants...etc.) The main features of this material are as following: 1. High recyclable, eco-friendly, saving forest resources2. with the look of the natural wood but less timber problems3. Moisture/Water resistant, less rotten, proven under salt water condition4. Barefoot friendly, anti-slip, less cracking, less warping,5. Requires no painting, no glue, low maintenance6. Weather resistant, suitable from minus 40°C to 60°C7. Well done of Termites, insects, and moldy-proof8. Available in different colors9. Easy to install and clean Our company has been certificated of ISO9001 and ISO14001. The eco-friendly new material of WPC has been tested by INTERTEK based on ASTM of USA testing criteria. Sentai WPC owns the newly CE and REACH test reports which regarding more quality and the eco-friendly characteristic of the new material. Let's enjoy the outdoor life!