... fiber(wood powder,bamboo powder,etc)10%additives(Anti-UV agent, Anti-oxidant,stabilizers ,colorants,and etc.)Surface treating methodBrushing ... . Water-proof, moldy-proof, prevents rotting and moisture, anti-acid, alkali and pest resistance6. Environmental friendly, fully recyclable ... many years8. No painting, no glue, free maintenance9. Anti-slip, less crack and warp, barefoot friendly10. Good weather ...