The rubber dust cover is made by high quality silicone rubber. can be used to SFP. Color is black/white/red/blue,etc. Also accept customized size too. Besides the rubber dust for USB A, we have rubber caps and rubber plugs for RJ45, DP,DIV,SFP, RJ11,MICRO USB PORT,TYPE-C, RCA,HDMI.AUDIO-A,AUDIO-B,DB-9,VGA,RS232, IETS,SD-A,BNC,AV,EX1R,DDR123, SD-E,PCI,PCI-E,AGP,USB-B, MINI USB, ETS MICRO HDMI,SFP-B, MINI DISPLAY PORT,DB25,LPT,ESATA-A,FIREWIRE800(1394-9),ETC.

● Protect BNC ports from being exposed and keep your network equipment safe from dust, debris and moisture, extending the lifespan of your device.
● Fit for any standard BNC ports of switches, routers, network cards & media converters and more.
● Made of high quality durable and reliable silicone material, exhibit a high level of resistance to harsh environmental factors and retain their shape and flexibility even after frequent use.
● Easy to insert and remove, fit snugly and stay in place.

Audio A 3.5mm Earphone Silicone Rubber Dust Cover will protect your device from dust and water. 
Net Weight: 1g; 
Material: Silicone Rubber 
Item(s) Included: Earphone Port Dust Cover 
Fit for: Audio A 3.5mm Port

Audio 6.35mm Earphone Silicone Rubber Dust Cover will protect your device from dust and water. 
Net Weight: 1g; 
Material: Silicone Rubber 
Item(s) Included: Earphone Port Dust Cover 
Fit for: Audio 6.35mm Port

Audio A 3.5mm Earphone Silicone Rubber Dust Cover will protect your device from dust and water. 
Net Weight: 1g; 
Material: Silicone Rubber 
Item(s) Included: Earphone Port Dust Cover 
Fit for: Audio A 3.5mm Port

● Protect USB ports from being exposed and keep your network equipment safe from dust, debris and moisture, extending the lifespan of your device.
● Fit for any standard USB TYPE A port of your equipment.
● Made of high quality durable ABS.
● Designed with a pull-out tab, easy to insert and remove, fit snugly and stay in place.