StarTech.com 10 Pack SFP Dust Cover for Open SFP/SFP+ Slot - SFP Plug - Fiber Optic Dust Caps - SFP Port Anti-Dust Cover - Network Switch Port Protector - Durable TPE Material w/Pull Tab (SFPCAP10)This 10 pack of SFP dust covers provides an inexpensive way to protect your network switches and fiber optic equipment from dust and contaminants, by covering the exposed and unused SFP slots. Protect your network equipment investment Simply insert the dust covers into any empty SFP SFP+ slots in your network switches. Made of Santoprene thermoplastic rubber (TPE), the durable dust covers keep out dirt and dust, protecting your networking equipment