The CLETOP 2.5-mm Adapter Cleaning Sticks are used for fast removal of dirt, dust, oil, and grease from optical fiber adapters. They are designed for cleaning FC, SC, ST and D4 connectors in adapters. Use them to clean hard to reach areas, ferrule end-faces, inside the plug, in fiber optic connectors and various adapters. No alcohol or solvents are required. Pack of 5 sticks inside.