Can you guess what it is?

In my office, I have several pieces of wasted oilfield detritus. This was from my trip to Houston to do some training, and I use it as a tee for my American Football!

Practically blinded myself taking it mind.

So, answers on a postcard..."prizes" for guessing a) what / where it comes from, and b) what it is / resembles from a non-oilfield application...