After buying your first start set a lot of families want to know, "How should I add on?" Rokenbok has been designed so that all our contruction toys, building sets, and vehicles all work together. More construction sets, building pieces, and vehicles equals more fun! At the same time, some of our construction sets work better with certain remote control vehicles than others. We've also designed some sets specifically as perfect additions to our start sets! So here's what we recommend based on what product you've started with.