Old Spectrum System 96 glass fusing sheet glass. This is an opaque glass with beautiful color flow, from the Opal Art series. OGT continues this series, but it seems to be difficult to obtain, making this glass valuable. It can be used as regular stained glass for panel making and art projects. Color: Blue, Opaque Surface: S Smooth Size: Approximately 20cm x 30cm Expansion Coefficient: 96 *The color in the photos may differ slightly from the actual product depending on your viewing environment. *Stored at home for a long period. *If you purchase two pieces (two sheets), we will deduct 300 yen from the shipping and box charges.