Go ahead. Touch it, smudge it with your dirty hands. You know you want to. And that's okay. It won't hurt it. But it's probably something you'll only do once. After you spend the next half hour or so obsessively trying to get it back to its fingerprint-free state chances are you won't let anyone so much as give it a dirty look!

Quite obviously the appeal of each of these silicon cubes is the extraordinary level of polishing that yields a highly reflective mirror. In 99.999% pure solid-to-the-core silicon.

Ships pristine in foam and bomb-proof packaging.

Well, ok, maybe not bomb proof.

Weight of 10mm cubes is 2.33±0.05g, the 25.4m is 38.2±0.5g and the 50mm ~291g.