Fine Silver Cores
Here's a highly specialized item - these are finished cores for lampwork beads. Be careful using these, as they are very easy to melt. Work the glass cool - at the tip of the flame, and try to keep the silver core out of the flame. You may find that you will get some fuming from the silver which will colour your glass - clear will go golden-yellow for instance.
Jam them onto a stainless steel chopstick to hold them while working.
Of course - if you are not a lampworker - you can use these with polymer clay or epoxy clay to good effect and no danger of melting them!