The circular slide rule is metal,the diameters is 9 cm.

The brand is Goose. (鸿雁),Produced by Shenyang Seventh Tool Factory,1980s.

Please note:

The photo fully description the condition of the item.Please check carefully.Used items are almost never perfect. Before making a purchase,welcome to consult.If you have any needs,please feel free to contact me at any time.

International shipping: The seller provides a combined shipping:$20 (base)+$10 (additional 1 item)+..., up to $50.