The RAB Audio ProJax 40 Studio Monitor Isolators include 24 pieces used to create 8 individual configurations (for two monitors). This modular system allows for decoupling as well as a wide variety of configurations to focus in on your perfect listening position. ProJax comes with 24 configurable pieces. This includes eight base pieces, eight 1/4" risers, and eight 1/2" risers allowing for fine-tuning of monitor positions. This version accommodates 2 studio monitors weighing up to 40 lbs.