This presaturated 6" x 8.5" wiper is a hydroentangled polyester cellulose blend. The wipers are presaturated with a 70% Isopropyl Alcohol and a 30% deionized water solution. Each case comes with (12) presaturated 100 piece rolls and (1) convenient canister with a spring-closed lid. Recommended for ISO 5-8 critical environments.