To keep the price low, I've chosen to ship via standard mail (within the size specifications for non-standard mail). This item is made from approximately 10mm thick cedar wood. It's the one marked Ⓓ in the 6th and 7th photos. It only has a 4cm slit. You can simply pass your Yu-Packet Post package through the slit to check if it can be shipped. I created this item to be affordable so that as many people as possible can use it. I made the frame material thinner. There are no issues with accuracy or strength. Thanks to nearly 1,000 people who have purchased this item, I've been able to create a better product at a lower price. It's lightweight, and I think it's actually easier to use. I also have thicker boards made from popular cypress wood available. If you want something more durable, please purchase those. The photos are for size and shape reference. The item shipped will be the same. As a Mercari user myself, I created this item because I thought it would be useful. I believe you will be satisfied with it. Nearly 1,000 people have purchased it and have been happy with it. Wood is flexible, strong, and becomes more refined with use, and is environmentally friendly. Above all, the texture of wood is the best. I've received many comments saying they were surprised by how durable and good the item feels. I've been using it for many years myself. I will use recycled materials for packaging. If you purchase multiple items and they can be shipped together, I will reduce the price by the shipping cost. 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 #ThicknessGaugeRuler #ThicknessMeasurementItem #ThicknessMeasurementGoods Yu-Packet Post Thickness Gauge Ruler 4cm Thickness Measurement Ruler Scale Yu-Packet Plus Measurement Ruler Mercari Shipping Mercari Scale Shipping Ruler Thickness Measurement Ruler Thickness Measurement Item Thickness Measurement Goods Thickness Measurement Scale