This is a tool made of Japanese cypress wood to check if items can be mailed via Yu-Packet Post. It is not painted. It has 4cm, 3cm, and 1cm slits. The photos are for size and shape reference. The item shipped will differ from the photos. A similar item will be shipped. The material is approximately 15mm thick Japanese cypress wood. It doesn't bend or flex like a thin ruler. It's sturdy, like an actual postal slot. You can check beforehand whether you can crush and push your package in. I don't think there are any commercially available thickness measurement tools this thick. If you would like slits for measuring other thicknesses (e.g., 1cm or 5cm), please contact me via the comments section of the order acceptance page. It may take some time, but I will try my best to accommodate your requests. I will use recycled materials for packaging. If you purchase multiple items and they can be shipped together, I will reduce the shipping cost accordingly. I may change the shipping method between Yu-Yu Mercari Bin and Raku-Raku Mercari Bin without notice. Thank you for your understanding. #TakawataHandmade #TakawataPackingScale #YuPacketPost4cm #YuPacketPost #ThicknessMeasurementRuler