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The Hammer Obsession Tour Pearl is obsessed with performance This bowling ball uses the TourV2 Pearl coverstock which is the pearl version of the coverstock that made the original solid ball such a success. This cover is paired with the Obsession Tour core which has the same shape as the regular Obsession core minus the flip block. This core alteration results in less flare and less hook but with a more controllable reaction on medium oil conditions. The Obsession Tour Pearl gets down the lane smoothly with an aggressive backend motion and continuation through the pins. This bowling ball utilizes DOT! DOT allows you to drill anywhere on the ball and offers toughness to the ball.