Natural White dentalia or dentalium tusk shells, these are ribbed. We also carry the smooth dentalia shells. Review the drop box for quantity purchase selection. Sold in quantities of 4 dozen or in the bulk 5 oz container. The length varies from 1/2"-1" shells. The ribbing on the shells increases the shell thickness and hardness; compared to the smooth variety. Either or these two make great additions to jewelry. Snip this shell to the desired length and diameter for dentalium beads.