The Powerblock Elite EXP Stage 2 add on kit lets you expand your Elite EXP Stage 1 adjustable dumbbells from 50lbs (22.7kg) to 70lbs (31.7kg) per hand as you get stronger. This practical expansion kit lets you elevate your strength training sessions and adds 6 additional increments to the 50lbs set for greater challenge and variety. The kit offers a robust, yet compact design to allow for space-saving storage after exercising. This solid and durable add on kit can be further expanded to 90lbs (40.8kg) per hand using the PowerBlock Elite EXP Stage 3 add on kit. Safe and easy to use, the kit helps you save precious space in your weight room and it is supplied as a pair.