Building Blocks:
* Square: Cube, 35 mm X 35 mm X 30 mm, Tolerance: \pm 2 mm
* Rectangle: Rectangular prism, 105 mm X 35 mm X 30 mm, 70 mm X 35 mm X 30 mm, Tolerance: \pm 5 mm
* General Requirements: Non-toxic child-safe plastic, ISO 8124 or SLS Certificate, Soft/rounded corners (min 3 mm), Age Group: 3-5 years, Bright colors (red, yellow, blue, green), Pack: 150 pieces (50 of each size: 35X35X30, 70X35X30, 105X35X30), designed to bind/interlock, constant height/width, lengths are multiples of base unit, all blocks on top/bottom, easy connection/disconnection by children aged 3-5.