For Functional Fitness: Kettlebell Set by Gorilla Sports The kettlebell is one of the most popular training tools for functional strength training. This kettlebell set by Gorilla Sports combines tradition and innovation. The dumbbells are made of robust cast iron and have no welded seams. Therefore, they withstand even heavy loads during dynamic exercises like snatching and pushing. The highlight is the soft cover. It protects the floor from scratches and dampens noise. The bottom of the dumbbells are flattened so that they do not roll away unintentionally.