These bracelets are about 7.5 inches and come on an elastic cord. Each one has lava beads added so that you can dab your favorite essential oil on them to carry the scent with you throughout the day. Beads are roughly 10mm in size. Some may vary slightly. The chakra stone bracelets are made of several different beads as well. Including Purple Quartz, Blue Jasper, Turquoise Magnesite, Green Aventurine, Yellow Jade, Peach Aventurine, Red Jasper, and the lava beads.