Are you missing an operating manual? Sorry this is my first time and the manufacturer should provide an instruction manual or better yet a link to a video on how to use this product properly. As for the material, it has a strong chemical smell, similar to burnt rubber, I'm not sure if that's normal, but I think this smell seems uncomfortable to the body and should be washed before shipping. On the plus side, you have a step-up ring or any adapter ring and you connected it to another adapter ring. While one of the rubber fittings fits. It works perfectly. Just plug and twist. This will loosen the ring without using any other tool that could scratch the metal parts of your adapter.
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