PowerBlock Pro 100 EXP Stage 2 Add On KitIncrease your base Pro 100 EXP dumbbell set with the PowerBlock Pro 100 EXP stage 2 add on kit, offering 2 x 10lbs (4. 5kg) additional weights per dumbbell. It expands the set from 40lbs to 60lbs (18kg 27kg) per hand and lets you add challenge and variety to your strength training sessions. Compact, reliable and easy to use, the add on kit features a durable construction and a small footprint. It is supplied as a pair.