Four soft shapes, a tunnel, a slide, a step and a half-moon, rearrange into different courses so the same set stays interesting week after week. A 2.5" detachable hook and 1" sewn-in loop hold the pieces together during play and release when it is time to rebuild. Removable PU leather covers zip off for washing and give a waterproof surface that wipes clean, while high-density EPE foam inside cushions falls. The tunnel measures 19.5" square at 15" tall and weighs 3.3 lbs, light enough for a child to move.