First, our 2 flat pieces measure 30 inches (76.2 centimetres) deep by 60 inches ( 152.4 centimetres) long and 5 inches (12.7 centimetres) thick. We chose this design to enable kids to create steadier builds while also offering more cushiness. Next, our 2 trapezoid-like pillows which we call the beams, measure 30 inches in length (76.2 centimetres), 15 inches wide (38.1 centimetres) and 10 inches (25.4 centimetres) high. They were also designed with a flat top to provide more options for builds and play.