We have offered here a fun Asian Bamboo and Bone Abacus. This one has a Bamboo Frame with 13 rows of small bone beads, which are flipped up and down for counting. This one came back with a Military family who was in Japan after WWII, and was purchased there at that time. It is 6 3/8" long, 2" high, and almost 1/2" thick. It is in good condition, and would be good for learning to use, or just for decorative purposes.