Size: Approximately 293 x 400mm Thickness: Approximately 3mm COE: 90 This glass sheet, with a coefficient of expansion of 90, is suitable for stained glass and fusing. It generally works well with Bullseye glass sheets, which also have a coefficient of expansion of 90. However, since we have not tested all color combinations, we recommend pre-testing if you plan to fire them together. Notes: The thickness is more uniform than Bullseye glass sheets, so it can be used with relatively little waste. However, because it is 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 opaque white glass. It is not completely light-blocking, so it will transmit some light when exposed to strong light. Please note that the color of the glass may change slightly depending on the time of arrival.