To offer it at a low price, we have chosen to ship via standard mail (within the specified size for non-standard mail). This item is made from cedar wood with a thickness of approximately 10mm. This is the 3cm version of item Ⓓ shown in the 5th and 6th photos. It features a 3cm slit only. This was created for Nekoposu shipping. We created this item to be affordable so that as many people as possible could use it. The frame material has been made thinner. There are no issues with precision or strength. It is lightweight, and we feel it may even be easier to use. We also have other items available with a more robust construction. Please consider purchasing those as well. The photos are for size and shape reference. The item you receive will be of equivalent quality. This item was created out of necessity by myself, a Mercari user, who thought it would be useful. I am confident you will be satisfied with this product. Over 900 customers have enjoyed and appreciated this item. Wood is flexible, strong, becomes more refined with use, and is kind to nature. Above all, the texture of wood is superb. We have received many comments expressing surprise at the durability and pleasant feel of the product. I have been using it myself for many years. We will use recycled materials for packaging. If you purchase multiple items and we can combine them for shipping, we will offer a discount equivalent to the shipping cost. #TakawataHandmade #TakawataPackingScale #Yu-PacketPost4cm #Yu-PacketPost #ThicknessMeasuringRuler #ThicknessGauge #ThicknessMeasuringItem #ThicknessMeasuringGoods Yu-Packet Post Thickness Gauge 4cm Thickness Gauge 3cm Nekoposu Measuring Ruler Gauge