• Accessory set includes run elements needed to build marble runs from Mini Building Box and Basic Building Box
• Compatible with common components from other manufacturers
• Can convert any standard building blocks to marble runs
• 55 parts and components
• Manufactured in Germany under highest quality standards
• Suitable for ages 4 , particularly intriguing for master builders ages 8-12 years
• 100% compatible with building blocks from other manufacturers
• Made in Germany for excellent product quality
• Playful learning with STEM building sets
• Focus on balanced relationship between play fun and learning effect
• Baseplate sold separately