This item was stored long-term at my grandfather's house. The backing card inside the box has some stains, but the Buddhist prayer beads show no noticeable dirt or damage. The prayer beads have a tag from the Kyoto Buddhist Prayer Bead Manufacturing Wholesalers Association. I do not have any specialized knowledge. 25 beads, 6 tassels. Approximate measurements by a non-professional: large beads 1.8cm, medium beads 1.3cm, small beads 1cm.