We found these amazing skull beads in Nepal, hand carved and with better detail then most skull beads we have seen.  They were too large to make a 108 bead mala so we had them strung as a 50 bead necklace.  They can be worn around the wrist as well. 

50 amazing quality skull beads 26 inches around each bead is 3/4 inch by 1/3 inch