IronMind One Wicked Wrist RollerFor anyone engaged in an all out assault on their forearms, wrist roller training is a must. The One Wicked Wrist Roller trains your grip, wrist and forearm in a flexion extension movement, like when doing wrist curls (regular and reverse). It is designed so that you train both concentrically (winding up the cord) and eccentrically (allowing it to unwind under control). Made of two inch diameter knurled high strength steel with a 10ft climbing grade