Thank you for viewing! This is a set of 100 thick cardboard sheets (cardboard) with a good thickness, convenient for packing, shipping, and crafting. 【Key Points】 ★ Ideal for preventing bending of postcards, L-size photos, and trading cards. Slightly larger than the standard postcard size (148 x 100mm), cut to approximately 150 x 102mm, so the corners won't stick out, providing peace of mind against bending and corner damage during shipping. ★ Reversible: White on the front / Gray on the back The front is plain white, so it can be used for: ・Writing messages ・Stamping ・Thank you cards and backing sheets 【Product Details】 ・Size: Approximately 150mm x 102mm (a few millimeters larger than a postcard) ・Thickness: Approximately 1mm (not flimsy, but with a solid thickness) ・Quantity: 100 sheets + a few extra ・Material: Thick paper (cardboard) 【Examples of Use】 ・Reinforcement material for trading cards, photos, and postcards when shipping on Mercari/flea market apps ・Backing sheets for handmade works ・Crafting and paper craft materials ・Core material for wrapping and packing 【Please Note】 Due to manual cutting, there may be: ・Slight size errors ・Individual differences in the cut edges ・Paper warping We ask for your understanding as a practical packing and crafting material. We have included a few extra sheets as a result. ※ Please refrain from price reductions as shipping is included. Immediate purchase is welcome!