Not only is are the company’s Holland pavers made with 40% post-industrial recycled content, the product’s manufacturing process also emits 85% less carbon dioxide than the production of clay pavers and uses 85% less energy than the process for clay pavers and 50% less than the process for cement pavers. The pavers contain neither Portland cement nor clay and meet industry standards and ADA recommendations for slip resistance. They come in smooth and tumbled finishes.. 877.700.9501. www.calstarproducts.com.