This is a sheet of glass for stained glass. I don't know the details. There are also images with light shone on them, so please check the photos. The size is shown with a measuring tape in the image, so please check it yourself. I would be in trouble if you gave me a bad review saying the size was different after purchasing. Please understand that there may be magic marker marks, scratches, or tape attached. Approximately 145 grams, thickness 3.5 mm. Please use it for making small items. Items that have been listed for 2 weeks will be cut and sold as scrap, so please purchase glass you like as soon as possible. Shipping is via Click Post. I will pack it securely, but there is a possibility of breakage during transport. This is especially true if you purchase multiple items, as they will be packed on top of each other and become more prone to breakage. There is no compensation for breakage, so if you wish to ship as a fragile item, please contact me before purchasing, and I will change the shipping to a courier service with an additional shipping fee. Please note that recycled materials such as newspaper and cardboard will be used for packing materials. I will pack your order once payment is complete, so I cannot accept requests for combined shipping or changes after that. The limit for combined shipping is 3 sheets per package (4 sheets if they are small). Discounts will be applied from the second sheet onwards per package. Shipping is set for 4-6 days, but I ship as soon as it is ready. If the total weight including packing materials is within 1 kg, it will be shipped via Click Post. If it is within 2 kg, it will be shipped via Yu-Packet Post.