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From MTG Wiki
The Deck Builder's Toolkit (Kaladesh Edition) is a box set that was released on September 30, 2016.  It contains 100 basic land cards (20 of each type from Kaladesh), 40 of 125 semi-randomized cards suitable for building several different Magic decks, four 15-card booster packs, two from Shadows over Innistrad block and two from Kaladesh. You also get a deck builder’s guide with tips about building the best Magic decks, a Magic "learn to play" guide and a full-art reusable card storage box.
All the fixed and semi-random cards in the box are from Shadows over Innistrad, Eldritch Moon, Kaladesh and Welcome Deck 2016.
Each toolkit contains 85 fixed cards (together with the 100 basic lands). These are the five rare cards that don't appear in Kaladesh boosters, followed by the rest of fixed content in WUBRG order:
The semi-random portion of the Deck Builder's Toolkit consists of 4 groups, out of 11 possible groups, each of 10 cards (6 Commons and 4 Uncommons) and representing one of the 11 possible deck strategies. They are separated by one of the four above mentioned Prophetic Prisms:
Magic: The Gathering sets