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, TAA

These are made of soft rubber. Easy to install and fit perfectly.

I had purchased some used switches that were missing dust covers, and needed something to keep the ports clean. These worked great.

They’re perfect! just what I needed to plug the unused fiber ports on my network switch(Linksys Biz LGS318) and security appliance/router(Sophos XGS 126w). The fit was perfect in each empty SFP port to fully protect them from dust and any other foreign matter that otherwise could get in there and interfere with future port performance if needed.

They do exactly what they are supposed to (keep dust out of ports). They also look neat and professional in our data center. Highly recommended.

These are great dust covers for unused sfp/sfp+ ports. I purchased a netgate firewall and the ports were open. These fit the bill. They're inserted and removed easily but are snug in the port. No complaints.