Pretty easy to use, I've only made one so far using ACS and it turned out really well
Make Custom Metal Clay and Lampwork Beads using these exclusive fine silver bead cores.
These bead cores are sized perfectly to slip onto the popular Pandora™, Chamilia™, Biagi™, and Trollbeads™ type interchangable bead charm bracelets.
Inside diameter: 4.5mm (.173")
Width between flares: 3.5mm (.125")
This is a pack of 4 fine silver embeddable 1/8" flared bead cores.