Choice® NW 500 is composed of a hydroentangled nonwoven blend of 60% cellulose and 40% polyester. This combination provides Choice® NW 500 with a level of absorbency, abrasion resistance and chemical compatibility required for controlled environments. It’s Choice®. The value tiered category of wipers offering all the performance consistency of higher priced wipers. Best of all, Choice® is from Berkshire, the most trusted name in contamination control products. Which means quality you can count on. What’s more, Choice® is backed by the Berkshire Guarantee – your money back if our wiper fails to perform according to specifications.