Transparent version of soft glass puzzles. Cut from transparent stained glass and then run through the kiln to gently slump the edges to eliminate any sharp cutting surfaces rendering the puzzle bits safe for all ages. Watch the video, click here. Moonshine Mosaic: The size varies between 0.5-2cm and they are 5mm thick for combining with our other glass products. Clean, slightly rounded edges make puzzling and grouting effortless and it makes the spaces between smaller for a more professional finish. These tesserae are not meant to be cut as the mirror backing may be damaged by the nipper blade.