An electronic device and accessory device are disclosed. The devices may be designed to magnetically couple together. Accordingly, each device may include one or more magnets that magnetically couple. In order to maintain the magnetic coupling and resist some at least some force or forces acting on, for example, the accessory device, the magnets may include a shape designed to increase the amount of force required to move the magnets in the accessory device relative to the magnets in the electronic device. The shape of the magnets may include polygonal shapes such as a trapezoid or a triangle. Magnets, having a trapezoidal or a triangular shape, magnetically couple with one another, may provide a stronger counterforce to lateral forces acting on the magnets.