6mm round. These are dyed rich red bamboo coral beads. The color varies from bead to bead because of the natural characteristics of the coral. Lovely colors! You get a 16" strand of beads with an average of 66 beads per strand. FYI - There are very strict rules set in place regarding the importation of coral into the United States. International law protects the rarest and endangered coral in all parts of the world. Many varieties of coral are considered sustainable and in reality they grow faster than they are being harvested. These are hand cut beads! As with any handmade bead, please expect slight imperfections in size, shape and color.