10 half circle curved elements which combine perfectly with any of the building sets in Grimm's Large 4 x 4 building block family. "4 x 4" means the blocks have a thickness of 4 cm (1.6 inch) thickness. Grimm's makes their largest blocks uniformly 4 cm thick, so different blocks sets have a uniform thickness allowing any or all of to be mixed and matched. Kids can build and create without their amazing structures falling down before they are finished due to uneven pieces. For this reason, the Rainbow Circle Blocks are the perfect addition to any other 4 x 4 (Large) building sets, such as Grimm's Large Romanesque Blocks, Basic Building Set, Standard Building Set, or Large 1001 Nights Blocks. Of course it is super on its own for tunnels caves and bridges. Two gigantic complete rainbow semicircles (10 pieces total) for great block building possibilities! A circular wooden storage tray is included.
Each Rainbow Semicircle standing up is 20 cm (7.9 inches) in height. The diameter of the full circle the tray is 44.5 cm (17.5 inches). Each wooden arch block is "4x4:" 4 cm thick and wide (about 1.6 inches).