Panelcraf® Red Dream Builder - 19 Piece Set includes 11 red (9"x9") open window pieces and 8 white window pieces. Our most affordable building set, the Panelcraft™ Red Dream Builder is ideal for the beginning builder, and appeals to boys and girls of all ages. Their US patent pending connection system and large 9 inch x 9 inch size allows construction of toy furniture, towers, play houses and can be used with existing toys giving them extended value. What you can build is limited only by your imagination! They work well alone, with other Panelcraft™ sets. Perfect for individual or multi-child play, Panelcraft™ develops both fine and gross motor skills, patterning, shape recognition, and building. Comes with STEM-themed activity guide.