The Magic Wand is a connecting channel made of polycarbonate that will physically connect the Magic Trackpad to the Apple Wireless Keyboard. The use of a plastic material is deliberate, so as not to scratch the metal of the two connected peripherals.
Connection is via a simple snap-on. And there’s no issue with handedness, you can connect the Magic Trackpad to either the left or the right of the Apple Wireless Keyboard.
All up the Twelve South Magic Wand weights 45 grams. So as not affect the Tap to Click function of the Magic Trackpad, you are able to put a small gap between the trackpad and the keyboard.