The Lapis Rollybar is a resin (climbing hold material) bar which you suspend from a beam, girder etc. and use as pull up apparatus in training for climbing.
The big difference between this and a standard pull up bar is that this bar spins! The very fact that the bar spins on a central axel means than holding on is much harder, and far more reliant on core tension and strength, rather than grip and positioning. The bar does have a ridge running down it length, which does help in getting used to using the apparatus, however once mastered pros will utilise the smooth rolling pin grip on the other side of the bar.