Our seamless hollow round beads are plated with genuine gold plating (see also silver plated) and come in several sizes from 2mm up to 5mm (silver plated 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.