Our ST Fiber Optic Dust Caps are an essential accessory since they help keep ST Fiber Bulkheads free from dust and debris. The fit snugly over the bulkhead, so not only are the end faces protected, but valuable time is saved by not having to clean the end faces prior to connecting an ST Fiber Optic Cable. They're made from a soft, flexible rubber which makes them easy to work with and prevent the bulkheads from getting scratched during installation. We offer different colors so you can easily identify the cap when it's installed on a bulkhead or if you prefer to use different colored caps for specific fiber modes on your patch panel, network rack, etc. The 10 pack is a smart, economical choice so you have a few extras on hand for when you need them.