OUR PRODUCTS SOLID BLOCKS 8 INCHES X 8 INCHES 16 INCHES (20cm x 20cm x 40cm) Hollow Concrete Block 8-Inches (20x20x40cm or200x 200x400mm or 12M2) SOLID BLOCKS 6 INCH / 15cm / 150mm 6 INCHES X 8 INCHES 15cm x20cm x40cm HOLLOW BLOCKS 6 INCH / 15cm / 150mm 6 INCHES X 8 INCHES 16 INCHES 15cm x20cm x 40cm ACTIVITY SITES