What’s Inside the Kit -- Fiber Cleaning Cassette, 1.25mm and 2.5mm Fiber Optic Cleaning Pens; Cleaning Cotton Swab; Dust-free Paper, Air Blowing and Brush, Alcohol Pump Bottle; Water-proof Carry Bag | Why Do You Need This Kit -- Research has shown over 85% of fiber optic network failures are caused by contamination on the optical connector end-face. For best optical performance, it is imperative that all optical fiber connections are clean and free of contaminants | This is a Practical and Useful Tool Kit -- We carefully select and group those fiber optic cleaning products which are essentials for your fiber optic cleaning tasks. They can effectively and quickly clean connector end-faces, remove dust, oil, and other debris | A Cost-effective Fiber Optic Cleaning Tool Kit -- Fiber Clean Cassette can be used more than 550 times for FC, SC, ST, LC, while 1.25mm / 2.5mm Fiber Cleaner Pens can be used more than 800 times. Low cost per clean | Superior Quality Products for Wide Application -- for using on fusion splice prep, connector end-faces on jumpers and through bulkhead adapters, can effectively prepare fusion splicing, clean connectors, maximizing network performance