Each lot is for a box of 6 packs, one pack of each color from Magic the Gathering plus a colorless pack (so the "red" pack contains only cards that are red). Each color pack will include 10 rares plus 1 mythic of the color and one foil card (usually common/uncommon but could be a rare+). The colorless pack will be 10 rares, no mythics. All cards are NM. There are no duplicates within the colors (this is not guaranteed if you buy multiple lots). 

Pictures are examples and do not reflect what you will find in your box.