Rubber Dust Cap Covers for FC Mating Sleeve/FC Adapter, 100pcs/pack are designed to provide effective protection for unused FC fiber optic ports. Made from high-quality flexible rubber, these dust caps fit securely over FC mating sleeves and FC adapters, helping to prevent dust, debris, and moisture from entering and damaging internal components. Ideal for use in telecommunication, lab, and field environments, this cost-effective 100-piece pack is perfect for bulk applications, routine maintenance, or equipment storage. An essential accessory to ensure long-term performance and cleanliness of your fiber optic systems.