The towers are 4x4x8 inches (approx 10x10x20cm). Towers can be used together or separate from the dice tray (4.25 x 2 x 8.25 inches (approx 11x5x21cm)

All full size dice towers are sold as kits - including all components and assembly instructions. All it takes is glue, rubber bands and about 10 minutes to put a dice tower together.