These rhinestone beads have prong set crystal stones on a silver finish metal base. With a silver plated grommet in the center, the 4.5mm hole size is compatible with the most popular charm bracelet systems around today. However, because each crystal stone is prong set, you may find these beads sometimes have an occasional sharp edge so they may be more comfortable when used in a shamballa bracelet. These beads will also work great with multi-strand projects, cord, leather and ribbon.