... wood powers as the main material, mixed with high density polyethylene and some necessary chemical additives. So it is ... Requires no painting. No glue11. Durable in use and low maintenance12. Weather resistant, suitable from mius -40 to 60 ... (Wood texture strong, resistant to abrasion, impact resistance,high-density, waterproof, moisture-proof, anti-termite, easy installation.etc.)CERTIFICATION ...