Yea, they are available online (google it.) The rolling thunder is like a thick bar that rolls around that you hang weight from. And the coc grippers stand for captains of crush, they are like sporting goods store grippers, but are made of steel and have resistance ranging from 140 lbs for the #1 to the #4 which has 365 lbs of resistance to close and like 5 people have done it. They are only like 20 bucks each and its kinda fun to challenge your friends to crush one, nobody ever can unless they train on it. Ive liked using em so much i often devote a day just to grip training and am interested in grip contests by themselves now, grip training can be taken quite far.
Seriously tho, once i used chalk, even before i trained grip, my grip on deadlift was no longer a problem, it is amazing how much it helps, you'll be suprised. Just give it a shot, its like 2 bucks.