NCSUmax

After reading about 40 posts on speed sensors I finalyl went out to my car to pull mine out. I have a rubber cap on top of it, I pull it straight up and it comes right off. inside there is some kind of silver "sunburst" design. There is oil buildup around the edges and the part left in the car las a silver circle on top. I dont remember reading anything about that. Or am I looking at something that isnt the speed sensor?