Fentech Cheap waterproof outdoor garden boat co-extrusion PVC plastic vinyl decking The decking are made of 100% Vinyl material, doesn't contain any wood.Since PVC is non-absorbent and contains no wood fillers, it will not mold, mildew,or fegrade. The product's low water absorpton property makes it deal for high humidity, pool or marine environments. Maintenance is simply reduced to periodic cleaning with mild household soaps. ASA/PVC Co-Extrusion technology makes the decking are coated with ASA material which is the best outdoor plastic for rich colors.