Grow your colourful crystals in the container provided. It's a fun and sparkling chemistry experiment. Provides enough materials to grow 1 large (2" x 1.5"), 2 medium (1.25" x 1"), and 4 small (1" x 0.75") crystals in 4 different colours (red, blue, purple, white). Includes detailed instructions. For ages 10 years and up.