KBShimmer describe Jack as "a black jelly with orange hex glitters in several sizes and micro orange bars. Black hexes and shreds complete this polish". (Source: KBShimmer Shop)
I don't have anything to add on that, so I'll just show you some pictures.
I used four coats with two coats of Essence Better Than Gel Nails Top Sealer as top coat. The formula on this one is good, I could polish my nails normally, no dabbing required.
Jack is part of the fall collection and is still sold at the KBShimmer shop.
As they don't ship internationally, I bought mine from Harlow & Co., but at the moment it's sold out. I don't know if there will be another restock.