Gotta get a new dentist.
Is a G10 pin, a 3/8 x 10 pin ?
Go to "Ask the cuemaker" section and search this. All you want to know. BTW, they're not all the same quality. Just do some searching on this and you'll get the info. you want. http://forums.azbilliards.com/showthread.php?t=302303
Lots of folks swear by them. I personally dont like them, but YMMV.
I think they are used for weight and balance more than anything specific to the material vs a metal pin but that was from reading about them years ago so my memory may be off a bit.