Hard to say exactly but it's glass, for one.
The smaller beads are plain frosted or camphor lampwork beads, e.g., :
The larger beads are also lampwork beads from what I can tell. There are so many different styles that look similar to that bullseye pattern but perhaps it is a sort of non-phenomenal example of Venetian millefiori?



To be fair/play devil's advocate, here is an example of a completely different type of bead that also uses similar bullseye designs, kiffa beads:
Definitely not kiffa beads but just showing you that the styling is not unique to venetian beads although extremely common to them.
-mcl