You can use almost any hard, smooth object for a guitar slide. I used to use a 1-inch ball bearing. and some other things.

A bottleneck is, typically, the top inch or so of a Budweiser Longneck bottle. It slips over your little finger and leaves the other 3 fingers free for conventional fretting.


Flatfoot sez: Call me when 'Talent-in-a-Box' is ready to ship! -- [8{>

Got some tunes on You Tube:
http://www.youtube.com/user/flatfoot50
.
My BiaB lesson site:
http://jdwolfe0.wixsite.com/learnbiab