Giddy Up Blendy Pen El Grande Kit Includes 24 Blendy Pens, 12 Fusion Chambers, 1 Blenda Blasta Tool, 20 large (8" x 10") Surprise Art posters, 10 stencils and instructions Combine markers in any combination for hundreds of different color blends Posters reveal surprise patterns when colored in Fusion Chambers feature peer-in windows for previewing color blends Markers and Fusion Chambers snap together for neat storage