very good materials used. I searched on amazon and finally zeroed on this product. ?The pipes are heavy and claimed to be stainless steel. Only time will tell on long run if they are really steel or chrome polished. The rails are metal with plastic wheels and the strings are good nylon. All other fittings are as described. The one page installation instruction is good and informative. This was the only size available and price compared to others are reasonable. Lets hope its worth the price and last long.