Force USA Functional Trainer Weight Stack Upgrade (2 x 30kg)Turn your current 60kg weight stacks on the Force USA Functional Trainer into 90kg each with this convenient upgrade package. Featuring two 30kg (66lbs) weight stacks, you can now push yourself to the limit during every session. This upgrade is a great solution for training studios or multi use households that have a range of user strength levels. KEY FEATURES READY TO LEVEL UP YOUR STRENGTH GAME? If youve outgrown your current 60kg weight stacks and