Azek is a PVC decking, composed solely of Polyvinyl chloride. It contains NO wood. It is a more expensive option in decking but its lower maintenance and resistance to staining, scratching, and fading is significant compared to other products available. It is a solid cellular plastic free of all wood ingredients. It will NOT fade, warp, crack, stain or splinter! Azek has had an awesome 25 year warranty but this past year they’ve added an Alloy Armor coating and have sinced extended the warranty to 30 years! It is more expensive than composite decking, since composite decking is a mixture of plastic, wood fibers and agents that bind the product together so it will be stronger and more substantial than just a wood deck but a wood-plastic composite is a cheaper product that doesn’t stand up like the PVC—and will most likely end up costing you aggravation and money in the long run!