Handcrafted by artisans using recycled cow bone. Each bead is individually carved and polished and is truly one of a kind. These beads measure approximately 12-14 x 22-24mm, with a hole size of 3mm. Strands measure approximately 26", and have approximately 40 beads each. Due to the handmade nature of these beads, some beads may have a wood core that is more secure than others.