Just two 2-inch diameter steel balls. They don’t do anything, and there isn’t anything special about them. But they’re nice and heavy, and they give you a good, “Is it heavy? Then it’s expensive, put it down” feeling when you hold them.
Kinetic Sand acts like damp sand, even when it’s dry. You can press it together to make shapes, castles, or anything you want to make. It feels nice, and squishing it around in your hands is great for stress relief.
If you don’t ever want to get any work done, get a pack of these metal puzzles for your desk. The solutions are not included (but can be found online), so you won’t be tempted to cheat.
This Rubi… I mean Newisland puzzle cube improves on the original design in a variety of ways, including rounded interior corners and a redesigned core that prevents the cube from exploding.