The Dagger is a deep dish putter with a bead. The deep dish means that more air can be trapped underneath the disc, making the Dagger stay longer in the air. The slow and stable flight gives you more control in your short game.
About Zero Hard: Zero Line is the grippy putter plastic used in Latitude 64's putters and approach discs. The plastic is chosen because of the good grip and feel. The feel you need in your short game!