These SC Mating Sleeve Adapter Dust Caps are designed to protect unused SC mating sleeves and adapters from dust, contamination, and accidental laser exposure. Made of durable black plastic, they are compatible with both simplex and duplex SC ports. Each pack includes 100 caps, ideal for use in data centers, telecom rooms, and fiber maintenance kits. Easy to install and remove, these dust covers help maintain optimal signal performance by preventing endface contamination.