3Dux Design Jumbo Connector Set. This collection of 6 uniquely shaped colored connectors is perfect for the truly independent designer. Used with your own recycled cardboard, children can create anything they can imagine. Students learn 3D spatial concepts, geometry, engineering and more. Make castles and kingdoms, parking garages, police stations even a fort big enough for a few kids and a pet! The connectors work with most single ply cardboard. 60 assorted colored connectors, recommended for ages 6 yrs and up, materials for 2-3 students, free standard-aligned online lessons and activities.