These stained glass sheets are perfect for all your crafting projects! Each sheet measures 12x12 inches and about 3mm thick - a great size for most stained glass, mosaic, or decorative projects. They're transparent cathedral glass with this beautiful iridescent finish that catches the light amazingly. The texture adds character and depth to whatever you create. What's cool is they're fade-resistant and work for both indoor and outdoor use, so you can make sun catchers, window panels, lamp shades, or garden decorations. They cut and score pretty easily once you get the hang of it, making them suitable for beginners and experienced glass artists alike. The package comes with two sheets in coordinating colors, giving you plenty to work with. The light transmission through these is gorgeous - they really come alive when the sun hits them. Just remember they're not fusible glass, but for traditional stained glass work, they're absolutely perfect and the quality is top-notch.