Reborn is the calcium reactor media I'm using now for my 400g reef. It's clean, nice and course and is ready to use right out of the bag. The 8.8 lbs of media was a little more than my calcium reactor could hold, so I'll have some to top off with later.
Reborn is a product of Two Little Fishies.
This is a 4 kilogram bag (8.8 lbs) of media.