Shell money most valued by the Native American tribes of the Pacific Coast from Alaska to northwest California was "Dentalium shell", a species of long narrow marine shelled mollusk, a tusk shell or scaphopod. The tusk shell is naturally open at both ends, and can easily be strung on a thread. This shell money was valued by its length rather than the exact number of shells; the "ligua", the highest denomination in their currency, was a length of about 6 inches. Farther south, in central California and southern California, the shell of the olive snail "Olivella biplicata" was used to make beads
Buddhist prayer beads effect. However, in Jōdo Shinshū, prayer beads are typically shorter and held draped over both hands and are not ground together. Jōdo-shū is somewhat unusual because of the use of a double-ringed prayer beads, called , which are used for counting nenbutsu recitations (i.e. recitation of the name of Amitabha Buddha): one ring contains single beads used to count a single recitation while the other ring is used to count full revolutions of the first ring. Additionally, other beads hang from the strings, which can count full revolutions of the second ring (flat beads), or full revolutions of the first