New INNOVATIVE hermetic manufacturing system. We use single piece metal moulds combined with high density “anti U.V.A.” polyethylene, making the final product unsinkable. It also provides high impact and abrasion resistance. THREE-PLY: comprised of foam polyethylene, with double thickness and internal connections. Compact, Integrated and airtight. Items included as standard: : 4 single skin wheels, one wheel on each corner, stairs, 2 propulsion wheels, double independent crankshafts. OPTIONAL EXTRAS: Large straight slide. Large curved slide. Wavy slide.