These black bone heishi beads are designed in the spirit of traditional Nigerian coconut heishi. While these beads seem nearly identical to their wooden coconut counterparts, do not be fooled. They are made of authentic recycled bone. While they look the same, they are more durable and a bit heavier than the traditional coconut beads. Each bead measures approximately 2-3 x 17-19mm, with a hole size of 2-3mm. Strand length is approximately 25". Truly a unique find!