This is a box set containing the Dungeons & Dragons (4th Edition) Player's Handbook (D&D 4e) and the Player's Handbook 2 (D&D 4e).
From the publisher's website:
Two Books, One Great Price
The Player's Handbook and Player's Handbook 2 contain all of the rules, classes, races, feats, skills, and items any player of D&D will ever need. Gathered together in a handsome slip-case, this special holiday collection offers both books at one great price!
This great holiday offering is just the thing for either the new or the dedicated gamer in your life!