You really don't need anything special, just clear glass and some opaques that don't mind being encased, i.e. not red, yellow or orange in large quantities. Seems like there was a tut for this somewhere, let me go look.
ETA OK, I don't know how to post a link, but go to the Tutorials page, and in Free Tutorials, look for "Mandrel wound implosion bead tutorial".
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ESC
Soft glass on a Minor/concentrator since 1996
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