First image shows glass unfired, second image showing 4 squares is a representation of what it looks like fired.  Black iridized spectrum coe 96 fusible glass.  Great size for coasters, jewelry or other small projects.System 96 is a family of tested-compatible glass products designed and produced to work together, both technically and artistically, in every facet of the hot glass arts; Glass Fusing, Glass Kiln Casting, Glass Blowing, Glass Torchwork.