The Power Block Sport EXP Stage 3 add on kit has been made specifically for use with Sport EXP Stage 1 & Stage 2 & ensures versatile & effective strength training sessions. This easy to use exercise tool expands Stage 1 & Stage 2 Sport EXP to 41kg (90.4lbs) per hand & offers a sleek, solid & compact design. Together with Stage 1 & Stage 2, it will replace 28 pairs of dumbbells & adds 6 additional increments to Sport EXP Stage 2 set (75, 77.5, 80, 85, 87.5 & 90lbs per hand). The add on kit replaces additional 449kg (990lbs) of free weights & guarantees enhanced durability thanks to anti-friction, non-textured paint.