Kids can create the creatures of their dreams with these colorful pieces—the possibilities are endless! Perfect for boosting STEM skills, the set lets kids build in 2-D or 3-D, encouraging open-ended play. Kit includes 255 pieces—240 color builders, a baseplate, 4 wheels and 10 hubs—plus a guide with instructions; chassis measure 1 4/5" x 1 3/8".