Power Lift ProSelect has taken weight stack machines to the next level. Most ProSelect machines feature an incredible 300 lb. weight stack that is adjustable in 10 lb. increments and comes with a 5 lb. weight add-on. Our weight stack machines utilize a 4-bar linkage strength curve system or biomechanically correct cams, and every machine features a metal weight stack shield for added safety. Make sure you have the best weight stacks with our ProSelect machines.