Three movement tools and four range tools, the components a game of Shatterpoint physically cannot run without. Movement tools decide how far a model actually travels, range tools decide whether an attack is possible at all, and none of that is ever estimated by eye.The most common reason to buy a set is that you built a collection out of squad packs. Those boxes hold miniatures and cards only, so a player who came in that way can end up with a full strike team and no legal way to measure anything it does. The second reason is a second player at the same table, because sharing one set turns every activation into a handover.They also work as replacements. The tools are thin plastic, they live in a carry case with metal and resin, and they snap, warp and go missing.You do not need them if you own a Core Set and only ever play one game at a time. Nothing in this pack differs from what is already in that box.