Size: Approximately 293 x 400mm Thickness: Approximately 3mm COE: 90 This glass sheet, with a coefficient of expansion (COE) of 90, is suitable for stained glass and fusing. It generally works well with Bullseye glass sheets, which also have a COE of 90. However, since we haven't tested all color combinations, we recommend pre-testing if you plan to fire them together. Notes: The thickness is more uniform compared to Bullseye glass sheets, allowing for relatively less waste. However, because it's not machine-rolled, there may be variations in bubbles, thickness on one side, and width (approximately 28.5cm to 29.5cm) depending on the manufacturing period of the rods. This model number is for a general transparent glass sheet. The presence of bubbles and wrinkles is irregular. Please note that the color of the glass may slightly change depending on the time of arrival.