Primary Colours Kit demonstrates that how various colors are obtain by colour mixing or overlapping  the three primary colors of light. Kit is provided with three colors tubes red, blue and green having adjustable movement and so that tubes can be easily moves up & down for mixing  or overlapping of colors. The colours tubes can be projected onto a piece of paper, translucent screen or wall depending on if you are doing a classroom demonstration or student group bench top experiments. Works on 220V AC , 50 Hz