This excerpt taken from the TWP 10-K filed Mar 17, 2008.
Our business could suffer from a lack of product diversification.
In 2008, we will derive substantially all of our revenues from sales of Trex Wood-Polymer® lumber. Although we have developed new products and applications since beginning operation in 1996, and intend to continue this development, our product line is currently based almost exclusively on the composite formula and manufacturing process for Trex Wood-Polymer lumber. If we should experience any problems, real or perceived, with product quality or acceptance of Trex Wood-Polymer lumber, our lack of product diversification could have a significant adverse impact on our net sales levels.