10 Vintage lampwork rondelle beads. 4x7.5mm 1.8mm hole
 
Lampworking is a type of glasswork where a torch or lamp is used to melt thin rods of glass over an open flame. When the glass is in a molten state, the glass is wrapped around a thin metal rod, which creates the hole. The bead is formed by blowing and shaping with tools and hand movements.