Appears to be high quality plastic with gaskets inside and they pull Cat 5 strain relief and make a good seal. I expect a lot of rain in my area and for the past several years I've only wrapped my Category 5 splinters in ziplock bags. I use cat5 for Christmas light shows, lots of cat5. Splinters get wet and rust. This is my attempt to find an affordable product. I've found more sellers selling 5 packs cheaper than this item.
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