Primary Science Color Mixing Glasses are a 20/20 way to learn about colors! Sized to fit a child, glasses feature easy-to-change lenses in 2 each of red, yellow, blue, and distortion lenses. Combine up to 2 lenses in each side of the frame to teach color mixing, or overlap lenses without the frame for kaleidoscope fun! Includes color-mixing Guide. Recommended for ages 3 years and older.