I cleaned up the bookshelf and found some tracing paper. Description of photos 1-5: It has a cover, and it says "Kokuyo B4 size, 40g/㎡". There are about 50 sheets. The cover has stains and dirt, but the paper inside is relatively clean, although it has some waviness. There are clip marks as shown in photo 3. Description of photos 6-8: This one doesn't have a cover, so I don't know the manufacturer or thickness. It's much thicker than the paper in photos 1-5. The size is the same B4 size. There are about 80 sheets. Both are old items and have been stored for a long time. Please consider this if you are interested.