Stained glass sheet glass. I don't know the details. There are also images with light shining through, so please check the photos. The size is shown in the image with a measuring tape, so please check it yourself. I don't want to receive a bad rating if the size is different after purchase. Please note that there may be magic marker writing, scratches, and tape attached. Approximately 121 grams, 4 mm thick. Please use it for making small items. Items that have been listed for two weeks will be cut and sold as scraps, so please purchase any glass you like as soon as possible. Shipping will be via Click Post. I will pack it carefully, but there is a possibility of breakage during transportation. Especially when purchasing multiple items, they will be packed together, making them more prone to breakage. There is no guarantee for breakage, so if you wish to have it shipped as fragile, we will change to Takkyubin (home delivery service) with added shipping costs, so please contact us before purchasing. Please note that we will use recycled materials such as newspapers and cardboard for packaging. We will pack the item upon completion of payment, so we will not accept requests for combined shipping or changes after that. The limit for combined shipping is 3 sheets (or 4 sheets for smaller sizes) per package. Discounts will be applied from the second sheet per package. We have set the shipping time to 4-6 days, but we will ship as soon as it is ready. If the weight is within 1 kg including packaging materials, we will ship via Click Post, and if it is within 2 kg, we will ship via Yu-packet Post.