This Mega Blendy Set contains hundreds of color possibilities. The 30 color-rich markers combine to make over 300 blends: Simply snap two Blendy Pens into a Fusion Chamber, twist and see the colors mix. Use your custom color blends to reveal hidden patterns on 20 Surprise Art coloring sheets, or use them to give your doodles amazing effects on regular paper.Melissa & Doug Mega Blendy Pen Set - Ages 5+-Kids