Zone cubes are already inside the Zone bricks pack.
If you mean Melting Plastic's pack. The description says nothing about such cube.
Siba's bricks seems alright. I'll try em out.
edit: All good. Siba's works perfectly. Thank you all.
double edit: Lol! I just unlocked this to tell you such a hilarious event.
There was a brick that held up other bricks that I wanted gone, so I was thinking I'll place a zone in that area. But a mistook the zone cube for a deletion cube which deleted the whole stuff. lol