Ultra tough ABS gym rings from Cyberfit Gym Equipment. These rings measure 233mm OD, 178mm ID, 28mm thick. Complete with 5m straps, and locking clips, so you can adjust the length as required.
These rings are great for dips, flyes, pullups, pushups - the possibilities are endless! By engaging so many additional supporting muscles, even basic exercises can become all inclusive workouts. For example, try doing parallel bar dips, but with a set of rings instead, and you'll find yourself working your delts, lats and of course triceps, in addition to targeting the lower chest/pecs.