... % Polyester Size: 4"*4", 6"*6", 9"*9", 12"*12" Cleanroom Wipers Description: the lowest contamination levels at an economical price, Effiiently ... Size: 4"*4", 6"*6", 9"*9", 12"*12" Application: Cleanroom wipers are widely used in PCB, LCD, Semi-conductor ,Chemical,instrument ...