Vex GO Electromagnet Field you will want to purchase

you will want to purchase them below

Contains one North and one South Pole

The Tool Kit v2 contains a set of tools needed to build with VEX EDR Star head screws

VEX 123 Robot & Coder Bundles include a robot in one of three colors

and is useful for determining if the target is a wall or a game object

Vex GO Electromagnet Field you will want to purchaseWorks with VEX GO products and accessories. The GO Electromagnet is a specific type of magnet where the magnetic field is produced by an electric current. The Electromagnet can pick up and put down the Disks which contain metal cores. The GO Electromagnet connects to any numbered port on the GO Brain.