This item was created out of a need expressed by Mercari users. I believe you will be completely satisfied with this product. This is a tool made of Japanese cypress (hinoki) to check if items can be dropped off in Yu-Packet Post. It has 4cm and 1cm slits. The material is Japanese cypress. Japanese cypress has a pleasant aroma and is very relaxing. Wood is flexible and strong, and it becomes more refined with use, making it environmentally friendly. And the texture of the wood is superb. It is not painted. The material is approximately 14-18mm thick Japanese cypress. It doesn't bend like a flimsy ruler made of thin material. It's sturdy, just like the actual post drop-off slot. You can check in advance whether you can crush and push your package in. I don't think there are any commercially available drop-off measurement tools with this much thickness. The photos are for size and shape reference. The item shipped will be the same. If you would like slits for measuring other thicknesses (1cm, 5cm, etc.), please contact me via the comments section of the order page. It may take some time, but I will try my best to accommodate your requests. Recycled packaging materials will be used. If you purchase multiple items and they can be shipped together, I will reduce the shipping cost at least by that amount. We may change between Yu-Yu Mercari Bin and Raku-Raku Mercari Bin without notice. Thank you for your understanding. #TakawataHandmade #TakawataPackingScale #YuPacketPost4cm #YuPacketPost #ThicknessMeasurementRuler #ThicknessMeasurementGauge #ThicknessMeasurementItem #ThicknessMeasurementGoods Yu-Packet Post Thickness Measurement Gauge 4cm