Our seamless hollow round beads are plated with genuine silver plating (see also gold plated) and come in several sizes from 2mm up to 6mm. They have a small hole just the right size for even your largest jewelry wire, yet small enough that the beads don't move around loosely on the wire or cord. They add a stunning enhancement to many types of jewelry. The photos provided are an attempt at coming close to the size, but the size chart is more accurate.