Thumb tacks, glass?

Now, I see on TNA that Abyss has his bag of tacks and glass and such… I want to know more about these weapons. The tacks look legit, are they? Are they made to have any kind of give in them. The glass? Tell me everything you know about glass and tacks. I’m not familiar with the miscellaneous weapons of wrestling, and those bums those guys take onto glass/tacks look pretty freakin sick man.