New composite members, for example, useful in decks or decking systems, rail or railing systems and window-coverings or blinds and the like, as well as methods for producing the same or like items have been discovered. The composites or composite members are easy to manufacture in a variety of configurations using relatively inexpensive materials. In addition, the composites are sturdy, lightweight and have excellent weatherability properties. In addition, the composites or composite members have many of the desirable properties of natural wood products such as fences and decks and railings. For example, the composites of the invention can be made to have a wood-like look and texture, for example, without having any wood content. Moreover, unlike solid wood fences and decks, the composites of the present invention preferably are highly resistant to effects of weathering.