Sanko brand one-touch abacus with 22 digits, comes with a case for convenient carrying. - Brand: Sanko - Model: One-touch abacus - Number of digits: 22 - Accessories: With case Thank you for viewing. My child used this for lessons when they were in elementary school. There is some dirt mainly on the case from use. The abacus has a one-touch function and is convenient. There are no problems with its operability. The abacus itself has small scratches and dirt, but is in relatively clean condition. As I will not be using it in the future, I hope someone else can use it.