The Chemtronics FW2150-12 is a 12 pack of Fiber-Wash MX Fiber Optic Cleaning Pens. The MX version is extra-strength and plastic safe. FOCCUS Fiber-Wash Precision Fiber Optic Cleaning Pens contain powerful solvent cleaners that quickly and safely cleans the end face of fiber optic connectors, splices and ribbons. They also dissipates static charge, which prevents attracting airborne contamination that cling to the end face surface. This non-pressurized container can be easily and safely transported. For best results, use with the QbE Cleaning Platform or CCT Clean Connect Tool and the Combination Cleaning process.