125+ colorful construction pieces Spring loaded marble launcher Double windmill marble drops Interlocking plates, gears, 3-D connectors, shafts, and channels Durable plastic Techno Gears Marble Mania Master Blaster is sure to be the craze for young budding engineers! This construction set features a spring launcher that blasts the marble trhough to the top of the twisting and turning tracks. This set includes over 125 pieces and a colorful manual. This product aligns with and supports STEM (Science, Technology, Engineering and Math standards). Ages 6+ years.