New, unused in open box. Some of the bags are factory sealed. See photos. The Mega Construx Magnext 5-in-1 Mag-Explorers Rover is a magnetic building set by Mattel, featuring a space-themed design with a rover character from the Mag-Explorers collection. Released in 2019, this set is made of plastic and magnetic metal, suitable for children aged 3 and up. Packaged in a box, this product offers endless creative possibilities for young builders to construct and play with their favorite space rover.