6 extra metal balls to expand SmartMax creations. All SmartMax sets are compatible with each other. The strongest and safest STEM-focused magnetic construction system available! Extra-large pieces are easy for small hands to manipulate. Magnets can carry 60 times their own weight, and have the ideal strength for easy assembly and break-down of constructions. Colorfully-illustrated booklets in each set present the basics of magnetic phenomena, building tips and construction projects from easy to advanced.

• Intended for children ages 3 years and older.